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• Clustering Strings on the basis of Common Substrings

  - by pk188

  I have around 10000+ strings and have to identify and group all the strings which looks similar(I base the similarity on the number of common words between any two give strings). The more number of common words, more similar the strings would be. For instance: How to make another layer from an existing layer Unable to edit data on the network drive Existing layers in the desktop Assistance with network drive In this case, the strings 1 and 3 are similar with common words Existing, Layer and 2 and 4 are similar with common words Network Drive(eliminating stop word) The steps I'm following are: Iterate through the data set Do a row by row comparison Find the common words between the strings Form a cluster where number of common words is greater than or equal to 2(eliminating stop words) If number of common words<2, put the string in a new cluster. Assign the rows either to the existing clusters or form a new one depending upon the common words Continue until all the strings are processed I am implementing the project in C#, and have got till step 3. However, I'm not sure how to proceed with the clustering. I have researched a lot about string clustering but could not find any solution that fits my problem. Your inputs would be highly appreciated.

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• World Location issues with camera and particle

  - by Joe Weeks

  I have a bit of a strange question, I am adapting the existing code base including the tile engine as per the book: XNA 4.0 Game Development by example by Kurt Jaegers, particularly the aspect that I am working on is the part about the 2D platformer in the last couple of chapters. I am creating a platformer which has a scrolling screen (similar to an old school screen chase), I originally did not have any problems with this aspect as it is simply a case of updating the camera position on the X axis with game time, however I have since added a particle system to allow the players to fire weapons. This particle shot is updated via the world position, I have translated everything correctly in terms of the world position when the collisions are checked. The crux of the problem is that the collisions only work once the screen is static, whilst the camera is moving to follow the player, the collisions are offset and are hitting blocks that are no longer there. My collision for particles is as follows (There are two vertical and horizontal): protected override Vector2 horizontalCollisionTest(Vector2 moveAmount) { if (moveAmount.X == 0) return moveAmount; Rectangle afterMoveRect = CollisionRectangle; afterMoveRect.Offset((int)moveAmount.X, 0); Vector2 corner1, corner2; // new particle world alignment code. afterMoveRect = Camera.ScreenToWorld(afterMoveRect); // end. if (moveAmount.X < 0) { corner1 = new Vector2(afterMoveRect.Left, afterMoveRect.Top + 1); corner2 = new Vector2(afterMoveRect.Left, afterMoveRect.Bottom - 1); } else { corner1 = new Vector2(afterMoveRect.Right, afterMoveRect.Top + 1); corner2 = new Vector2(afterMoveRect.Right, afterMoveRect.Bottom - 1); } Vector2 mapCell1 = TileMap.GetCellByPixel(corner1); Vector2 mapCell2 = TileMap.GetCellByPixel(corner2); if (!TileMap.CellIsPassable(mapCell1) || !TileMap.CellIsPassable(mapCell2)) { moveAmount.X = 0; velocity.X = 0; } return moveAmount; } And the camera is pretty much the same as the one in the book... with this added (as an early test). public static void Update(GameTime gameTime) { position.X += 1; }

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• What went wrong with my curl install?

  - by Danjah

  I'm fresher than the prince to Linux, I've been following the instructions here: http://chrisfulstow.com/running-node-js-on-windows-with-virtualbox-and-ubuntu (the link tells what I am generally trying to do). I'm all up and running in VBox, and am at the curl install part, I may have done the curl part a week ago I forget. So I ran this command anyway: danjah@danjah-VirtualBox:~$ sudo apt-get install curl Result: [sudo] password for danjah: Reading package lists... Done Building dependency tree Reading state information... Done curl is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. Then: $ curl http://npmjs.org/install.sh | sudo npm_install=rc sh Result: fetching: { gzip: stdin: unexpected end of file /bin/tar: Child returned status 1 /bin/tar: Error is not recoverable: exiting now It failed Should I be concerned? How can I test curl? How can I avoid these situations? Perhaps there's a generic way of checking to see if I've already installed packages/etc? Case specific answers and general advice most appreciated. cheers, d

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• Recommendations for stable, reliable flash drives

  - by Josh Kelley

  We're looking to purchase some flash drives for use in some embedded devices. Most of our requirements aren't too different the generic "good, fast" flash drive: reliability is very important, speed is good, and so that the drive will fit, the case shouldn't be too large (so no OCZ Throttles). Consistency is also a major priority; we'd like to be able to buy more or less the same product a year or two from now without having to worry about the manufacturer swapping drive components with less reliable or slower parts. (We've been burned already by our previous manufacturer doing this.) Any recommendations, especially regarding consistency? I can read Ars Technica to get an overview of current models, but what are consistently good models?

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• Share home directory between Linux and Windows dual boot

  - by user877329

  This question is somewhat similar to How to use Windows Share has home directory, but in this case Windows is not running. I have installed a dual-boot configuration with Ubuntu 12.04 and Windows. My Windows partition is mounted on /C. Now I want either Ubuntu to locate home directories in /C/Users Which is the location of windows accounts or I want Windows to use D:\home for home directories. (D is the name of the Ubuntu root directory). For the first approach, I have managed to create a test user account test-user:x:1004:1001:Test:/C/Users/test-user:/bin/bash The account works but test-user cannot run any X session. From .xsession-errors chmod: Changing rights on ”/C/Users/test-user/.xsession-errors”: Operation not permitted Would it help get rid of that chmod, which has no effect? How do I? If I use the second approach, I need the Ext2fsd driver, which seems to work, but I am not sure if Windows maps the Ext2 system that early. Here is my fstab proc /proc proc nodev,noexec,nosuid 0 0 UUID=e7cef061-ed8d-4a82-b708-0c8f4c6f297f / ext3 errors=remount-ro 0 1 UUID=2CDCEB43DCEB0644 /C ntfs defaults,umask=007,gid=46 0 0 UUID=b087b5c0-b4bd-47e7-8d34-48ad9b192328 none swap sw 0 0 Update: I found something here: http://www.tuxera.com/community/ntfs-3g-advanced/ Will work if i do a correct mapping between NT users and Linux users.

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• Windows 8.1 & manual removal of "Sentinel Runtime Drivers"

  - by uos??

  I'm trying to install Windows 8.1 (basic upgrade from Windows 8). It is complaining of Sentinel Runtime Drivers incompatibility. I've looked for it in my Programs & Features list, but it's not there by that name nor SafeNet (as related by google search) nor do I see any obvious candidates for it having been bundled with another listed application. I tried the "Sentinel Runtime Driver Cleanup" program from the SafeNet website. It ran but was ineffective, even after a reboot. Do you recognize this "Sentinel Runtime Drivers"? I ran MalwareBytes too, just in case, but it found nothing.

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• SSL client auth in nginx with multiple server section

  - by Bastien974

  I want to implement ssl_verify_client in nginx. This works perfectly when I only have one server section, which listen to 443. In my case I have multiple, all listening on 443 but to different server_name. For one particular server (proxy.mydomain.com), I'm adding the SSL client verify, but when I test the connectivity with openssl s_client -connect proxy.mydomain.com:443 -cert xxx.crt -key xxx.key and then do a GET / HTTP/1.1 host: proxy.mydomain.com It's not working, 400 No required SSL certificate was sent I think nginx is not receiving the proper server_name and is directing it to the first server listening to 443. So I tried to listen on another port and it worked right away. What's the issue and how can I fix it ?

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• HCM is Alive and Well in APAC

  - by Row Henson

  I just returned from a 5 country tour on “Rethinking HR” where Oracle hosted breakfast and lunch executive seminars to the most senior HR practitioners in 5 cities in these major markets in APAC. While I have done many of these “road shows” in the past, I was most impressed with the response we received during this trip. I’m sure the execution of our marketing and sales teams had lots to do with the turnout, but I’d also like to think that this region is primed for applications that help with the talent dilemma faced by many organizations today in this part of the world and are excited about the offerings Oracle provides to help our customers attract, develop, retain and analyze their human capital. For these type of events, we normally expect 25-30 companies in attendance with a drop-off rate of around 15%. In all 5 cities, we had standing room only with an average attendance of 50 people from 30+ companies. Interestingly enough, in 3 of the 5 cities we had people show up that were turned down during registration, for lack of room – so we actually exceeded our registration. This was the case in Canberra – Australia’s capital – with over 70 attendees. Unusual indeed! During my presentation I referenced several studies which highlight how this region is primed for support in looking at talent in the future as high growth creates talent shortages and talented workers see opportunities outside of their current employers. A Deloitte study shows that 61% of respondents in APAC expect significant or moderate talent shortages over the next year (compared to 45% and 31% for the Americas and EMEA respectively). Please accept my thanks to all who arranged and orchestrated this time in APAC. While my body was quite tired from the hectic schedule, my mind was energized with the interest and interaction.

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• How to set up a PC which can be booted from Linux AND Windows?

  - by Martin

  Our PC was running Windows XP up to know. It has become incredibly slow and I'm considering switching to Linux (Ubuntu?!) as a fresh OS. However, there are some applications we rarely use which run only on Windows and I also want to have the possibility to easily go back to the old system, if I should find during testing linux, that anything is missing or not available. So the idea is to install Linux on a new (second) hard drive and use the existing Windows XP from a virtual machine (converted by Paragon Drive Backup) in the transition time. We have a lot of data on the PC, tens of GBs of Photos (managed by Picasa), ... My questions: What could be the best way to setup the new hard drive? (Partitions) I assume that I can not access the Linux data from Windows but I could access (read/write) windows drives from Linux? Does anyone know good tutorials for this use case? What other things might I have to consider for transition Windows-Linux?

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• error 0x80070522. not able to create a file in c:\ directory

  - by Abbas

  Hello Everybody... "error 0x80070522. not able to create a file in c:\ directory" One of our customers has just found a problem when trying to create a file on the root of the C:\ Drive, on a Windows 7 Professional PC. I know they shouln't be keeping files here, but there is a valid reason in this case, so I've relaxed the security on the root of C:\ by giving the group 'users' modify permission. Before I relaxed the security, the user was receiving 'access denied', but now they are receiving the message: An unexpected error is keeping you from creating the file. If you continue to recieve this error, you can use the error code to search for help with this problem. Error 0x80070522: A required priviledge is not held by the client. Googling for this suggests that it is caused by UAC, but how can I get round this when the user doesn't have admin rights on their PC? So did you find a solution for this issue ?? Please its urgent to my accountant software..

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• How do I make a partition usable in windows 7 after power loss?

  - by user1306322

  A few days ago I was installing some software and power went down. When I rebooted, the partition to which the software was installed was not accessible. Disk manager shows that it's there, but doesn't show type, if it's healthy and gives me an error when trying to read its properties. The problem seems to be common after power loss, people recommend solving it by assigning a letter to the partition via DiskPart utility, but partition isn't listed in my case. I can access that partition with bootable OSs (like bootable Ubuntu or winXP) and all the files are there, but another installation of Windows 7 gives me the same results as the original. I could just copy all data to another disk if there was enough space, but unfortunately the size of partition I'm having problems with is 1.1TB. How do I regain access to the partition in my original Windows 7 installation without losing any data?

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• Automatic generate code: "derived work"?

  - by Peregring-lk

  For example, I've GPL software. I'm the author of this GPL software. This GPL software has, between its code, Doxygen comments. These Doxygen comments are written to generate a CC-BY-SA html page, in order to upload this generated documentation in my project website under CC-BY-SA license. But, the Doxygen documentation output is a "derivate work"? After all, this documentation is based on my GPL source code. In this case, the documentation must be GPL. But, I want the documentation is CC-BY-SA, because it is documentation. GFDL doesn't help. GPL code can't become GFDL (the opposite yes). If this output is really a derivate work, I think, creates a strange situation, because, if I distribute my work, the recipient users can't legally distribute the generated documentation: while with my work I can do I want, the users don't, thus, they have to distribute any derivated work with the same license I offer them. What is the solution?

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• How do I revert back to official Linksys firmware from dd-wrt on WRT56G2 v1?

  - by Chris Moore

  I've been having trouble with dd-wrt on my Linksys WRT56G2 v1 router and want to go back to the stock Linksys firmware for it. The router has only 2MB of flash memory, and so I'm running the 'micro' version of dd-wrt. My question is what is the best way to do that? I could use the http://router/Upgrade.asp dd-wrt "firmware upgrade" web interface to do it, in which case there's a dropdown menu choice for "After flashing, reset to": "don't reset" or "reset to default settings". Which should I pick? Some people say that I should use a program called tftp.exe instead. I can probably gain access to a Windows machine if this is necessary. Which of these is the way to proceed? I don't want to brick the router if at all possible! Note: I used the 'wrt54g' tag because I wasn't allowed to create a 'wrt54g2' tag due my low rep here.

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• What is wrong with my logic for the divide and conquer algorithm for Closest pair problem?

  - by Programming Noob

  I have been following Coursera's course on Algorithms and came up with a thought about the divide/conquer algorithm for the closest pair problem, that I want clarified. As per Prof Roughgarden's algorithm (which you can see here if you're interested): For a given set of points P, of which we have two copies - sorted in X and Y direction - Px and Py, the algorithm can be given as closestPair(Px,Py): Divide points into left half - Q, and right half - R, and form sorted copies of both halves along x and y directions - Qx,Qy,Rx,Ry Let closestPair(Qx,Qy) be points p1 and q1 Let closestPair(Rx,Ry) be p2,q2 Let delta be minimum of dist(p1,q1) and dist(p2,q2) This is the unfortunate case, let p3,q3 be the closestSplitPair(Px,Py,delta) Return the best result Now, the clarification that I want is related to step 5. I should say this beforehand, that what I'm suggesting, is barely any improvement at all, but if you're still interested, read ahead. Prof R says that since the points are already sorted in X and Y directions, to find the best pair in step 5, we need to iterate over points in the strip of width 2*delta, starting from bottom to up, and in the inner loop we need only 7 comparisions. Can this be bettered to just one? How I think is possible seemed a little difficult to explain in plain text, so I drew a diagram and wrote it on paper and uploaded it here: Since no one else came up with is, I'm pretty sure there's some error in my line of thought. But I have literally been thinking about this for HOURS now, and I just HAD to post this. It's all that is in my head. Can someone point out where I'm going wrong?

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• Understanding Application binary interface (ABI)

  - by Tim

  I am trying to understand the concept of Application binary interface (ABI). From The Linux Kernel Primer: An ABI is a set of conventions that allows a linker to combine separately compiled modules into one unit without recompilation, such as calling conventions, machine interface, and operating-system interface. Among other things, an ABI defines the binary interface between these units. ... The benefits of conforming to an ABI are that it allows linking object files compiled by different compilers. From Wikipedia: an application binary interface (ABI) describes the low-level interface between an application (or any type of) program and the operating system or another application. ABIs cover details such as data type, size, and alignment; the calling convention, which controls how functions' arguments are passed and return values retrieved; the system call numbers and how an application should make system calls to the operating system; and in the case of a complete operating system ABI, the binary format of object files, program libraries and so on. I was wondering whether ABI depends on both the instruction set and the OS. Are the two all that ABI depends on? What kinds of role does ABI play in different stages of compilation: preprocessing, conversion of code from C to Assembly, conversion of code from Assembly to Machine code, and linking? From the first quote above, it seems to me that ABI is needed for only linking stage, not the other stages. Is it correct? When is ABI needed to be considered? Is ABI needed to be considered during programming in C, Assembly or other languages? If yes, how are ABI and API different? Or is it only for linker or compiler? Is ABI specified for/in machine code, Assembly language, and/or of C?

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• Windows 7 Home Premium - Unable to View Chinese Characters Properly

  - by David

  Is there a proper and permanent fix that will restore the display of Chinese Characters on a Windows 7 Home Premium Laptop computer? This problem has been occurring frequently now and a simple reboot no longer does the trick. The square boxes viewed on many applications and websites has been constantly bothering me and I wish to fix it asap. I have done a lot of research on it but have not been successful. Many responses were to install the language packs for Windows 7 Ultimate Users which apparently is not my case or to configure the "Region and Language" settings of the Control Panel, changing the system locale. Does anyone have any suggestions? All would be appreciated!

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• What is the command to use to put your computer to sleep (not hibernate)?

  - by airrick

  I want to put my windows pc (win7) into a sleep state via command line (so i can bind to macro button on keyboard). The power button on the PC is setup to but the computer to sleep (but it's down on the floor and I'm too lazy to reach down) it exactly how I want it (sleeps using hybrid mode in case I loose power) The sleep command on the shutdown menu also works. most info I found says to use; %windir%\system32\rundll32.exe PowrProf.dll, SetSuspendState 0,1,0 But this puts the computer in hibernate mode. I do have hibernate disabled but using hybrid sleep. So, What is the command to use to put your computer to sleep (not hibernate)?

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• C# Preprocessor Directives

  - by MarkPearl

  Going back to my old c++ days at university where we had all our code littered with preprocessor directives - I thought it made the code ugly and could never understand why it was useful. Today though I found a use in my C# application. The scenario – I had made various security levels in my application and tied my XAML to the levels by set by static accessors in code. An example of my XAML code for a Combobox to be enabled would be as follows… <ComboBox IsEnabled="{x:Static security:Security.SecurityCanEditDebtor}" />   And then I would have a static method like this… public static bool SecurityCanEditDebtorPostalAddress { get { if (SecurityCanEditDebtorPostalAddress) { return true; } else { return false; } } } My only problem was that my XAML did not like the if statement – which meant that while my code worked during runtime, during design time in VS2010 it gave some horrible error like… NullReferenceException was thrown on “StatiucExtension”: Exception has been thrown by the target of an invocation… If however my C# method was changed to something like this… public static bool SecurityCanEditDebtorPostalAddress { get { return true; } }   My XAML viewer would be happy. But of course this would bypass my security… <Drum Roll> Welcome preprocessor directives… what I wanted was during my design experience to totally remove the “if” code so that my accessor would return true and not have any if statements, but when I release my project to the big open world, I want the code to have the is statement. With a bit of searching I found the relevant MSDN sample and my code now looks like this… public static bool SecurityCanEditDebtorPostalAddress { get { #if DEBUG return true; #else if (Settings.GetInstance().CurrentUser.SecurityCanEditDebtorPostalAddress) { return true; } else { return false; } #endif } }   Not the prettiest beast, but it works. Basically what is being said here is that during my debug mode compile my code with just the code between the #if … #else block, but what I can now do is if I want to universally switch everything to the “if else” statement, I just go to my project properties –> Build and change the “Debug” flag as illustrated in the picture below. Also note that you can define your own conditional compilation symbols, and if you even wanted to you could skip the whole properties page and define them in code using the #define & #undef directives. So while I don’t like the way the code works and would like to look more into AOP and compare it to this method, it works for now.

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• HTTP Caching Server that supports POST

  - by Jeroen

  I am hosting a REST service which is sending appropriate cache-control headers. I use Varnish as a caching server in front of my webserver. However, a limitation of varnish is that it doesn't support caching HTTP POST and HTTP PUT. Is there any alternate caching server that will be able to cache these requests? I understand that caching POST is a bit tricky because you cannot just cache based on the url as a key like for GET; it needs to actually inspect the request body. In case of multipart/form-data requests, there should probably be a limit on the size of the request body for it to be cached (so that big file uploads, etc won't be cached). Nevertheless I really want to be able to cache short HTTP POST, or at least the application/x-www-form-urlencoded ones.

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• Algorithm for rating books: Relative perception

  - by suneet

  So I am developing this application for rating books (think like IMDB for books) using relational database. Problem statement : Let's say book "A" deserves 8.5 in absolute sense. In case if A is the best book I have ever seen, I'll most probably rate it 9.5 whereas for someone else, it might be just an average book, so he/they will rate it less (say around 8). Let's assume 4 such guys rate it 8. If there are 10 guys who are like me (who haven't ever read great literature) and they all rate it 9.5-10. This will effectively make it's cumulative rating greater than 9 (9.5*10 + 8*4) / 14 = 9.1 whereas we needed the result to be 8.5 ... How can I take care of(normalize) this bias due to incorrect perception of individuals. MyProposedSolution : Here's one of the ways how I think it could be solved. We can have a variable Lit_coefficient which tells us how much knowledge a user has about literature. If I rate "A"(the book) 9.5 and person "X" rates it 8, then he must have read books much better than "A" and thus his Lit_coefficient should be higher. And then we can normalize the ratings according to the Lit_coefficient of user. Could there be a better algorithm/solution for the same?

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• 504 Gateway Time-out after php fatal error

  - by tiagojsag

  I'm using nginx and php-fpm to develop a symfony2 based website, under ubuntu 12.10 (yes, I know I'm using a beta OS). Everything was working out fine until, due to an error on my code, I called an unexisting function, and got the following: Fatal error: Call to a member function (....) This isn't a problem (it's a bug in my code, easily fixable), but after this, no other page loads. My browser just keeps trying to load the page from the webserver, until nginx timeouts (after +- 30s, which should be some default timeout) and returns: 504 Gateway Time-out Restarting php-fpm solves the issue. Nginx logs show a timeout message, and nothing appears on php-fpm logs, even if I set them to debug level. I tried switching from fpm to fastcgi, and the same thing happens. I've looked around, but all similar error are related to big requests/file handling, which isn't the case. All the pages on my website load in a few seconds, even under development conditions (no caching, etc).

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• pinx 501 with print server - 10 licenses

  - by ra170

  I have pix 501 with only 10 licenses. I'm already approaching this limit, running 2 computers at home, 2 laptops, PS3, iphones, 2 web cams..not everthing is on all the time, but it's possible as I'm looking into adding a print server, so that I can print from anywhere in the house. So my question is, will the print server count as a connection towards the license? I think it will need default gateway, which in this case will be my pix 501. I've seen somewhere on some othee board saying, don't set default gateway in the print server to pix 501, but then how would that work? is there a work around? I don't need to print from VPN or from outside, just inside..

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• Subdomain only accessible from one computer

  - by Edan Maor

  I recently added a wildcard A record to my domain (*.root.com), mapping it to a certain elastic ip on AWS. I've configured apache to redirect all references to something.root.com to root.com, except for one specific "dev" subdomain, which is hosting its own site (a Django app, specifically). The Problem: This setup works perfectly for me on my computer. But on other computers around the office, it doesn't seem to work. Specifically, trying to visit dev.root.com gives an "unable to find server" error. Pinging dev.root.com gives a "cannot resolve hostname" error. The weird thing: pinging any other subdomain of root.com does work, from all machines. I would think this was all due to DNS propagation, except all the computers are behind the same office router, so how could that be the case? Any ideas?

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• Will having multiple domains improve my seo?

  - by Anonymous12345

  Lets say I have a domain already, for example www.automobile4u.com (not mine), with a website fully running and all. The title of my "Website" says: <title>Used cars - buy and sell your used cars here</title> Also, lets say I have fully SEO the website so when people searching for the term buy used cars, I end up on the second or first page. Now, I want to end up higher, so I go to the google adwords page where you can check how many searches are made on specific terms. Lets say the term "used cars" has 20 million searches each month. Here comes the question, could I just go and buy that domain with the search terms adress, in this case www.usedcars.com and make a redirect to my original page, and this way when people search for "used cars", my newly bought domain name comes up redirecting people to my original website (www.automobile4u.com)? The reason I believe this benefits me is because it seems search engines first of all check website adresses matching the search, so the query "used cars" would automatically bring www.usedcars.com to the first result right? What are the downsides for this? I already know about google spiders not liking redirects, but there are many methods of redirecting... Is this a good idea generally?

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• Map mouse xbuttons to keypress?

  - by Will

  Hi, the utilities that come with my HP vector mouse are fairly basic. My old logitech G9, the best mouse ever made (except when it gets senile and starts having 'gaps') had a utility to map each of the buttons to a keypress, which I use in games, such as xbutton1 and 2 for run, etc. is there a utility, or a way, that I can map the 2 xbuttons on my new mouse so that they generate/simulate a keypress? I'm wondering if there are built in mappings in Windows that do this already, and its just a case of finding out what the keypresses are? thanks, Will

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