I was looking for a way to display a usage agreement page in browsers that users must agree to before they are allowed to access the internet. This would be for users on public computers and public/open wifi.

I'm using a sonicwall firewall which does support this feature, however, there is a rediculously low character limit which makes it impractical to use.

I thought about setting the browser's homepage to a usage agreement page, but that can easily be bypassed by navigating to somewhere else.

Are there any other approaches that may be worth considering?

There is currently no server in place on the public network, though I can set one up if need be.