Does anyone now how to achieve a "Secure-Desktop Mode" (effect) such as one gets from the Windows Vista/7 UAC consent-blocks?

I assume it is some function which will remove pixels here-and-there (and possibly graying them) and then finally drawing that to screen... I would like to apply it to my application to keep the user from doing anything until the another user connects to the system (but that is besides the point)

I would really appreciate the advise.

Kind regards

A

EDIT: i was really only looking for this

        graphicsFX.setColor(new Color(0, 0, 0, 0.8f));  
        graphicsFX.fillRect(0, 0, 800, 600);  

the defering of input i can do quite well...

Thanks for all....