I haven't seen it mentioned, so I'll toss in my 2 cents.
If the site runs with Internet Exporer, you can run IE in
Kiosk Mode. You do this with the command line switch "-k" when starting IE. The command line would look something like...
Code:
iexplore -k "D:\somedir\somepage.htm"
This actually locks down a lot of the IE features that would allow a "hacker" type to do nefarious things. Menus are gone, buttons are gone, certain command keys stop working. You would have to design and code the site to not allow avenues out of the site (i.e. jump to a Google search or other unsecured site).
An Alt-F4 does still kill IE, so you may need to use a keyboard on the Kiosk that doesn't have function keys and certain control keys. Some kiosks have an abbreviated keyboard accessible to the public, and a full keyboard for maintenance in a locked back or side panel.
I believe Microsoft.com has some more information on setting up kiosks like this.
You could also use psychological deterrents. Something like a dummy video camera in a painfully obvious location pointed right at the kiosk will cut down on a lot of "playing". Or, a real video camera in plain sight if there's real customer information at risk.
This whole setup is pretty cheap and easy to test. You could design a simple login page that only opens up to one that says "You Got It!". Then get some masking tape and mask off the entire top function key row and the Ctrl, Alt, and Window icon buttons (plus any other control or menu buttons). This eliminates the ones that wouldn't be available on the kiosk keyboard you're going to get. Then, run the demo page in IE in kiosk mode and let them try to hack into it.
Just do a Google search for "kiosk keyboard" and you'll find tons of keyboards and other items designed for this kind of use. You can even have no physical keyboard, but just a virtual one on screen.
The bottom line, you don't want to just park a PC in a public spot and hope it's not molested. BUT, just adding a few easily available things to it, plus some intelligent site design, you can have a very secure kiosk set up.
Hope this helps.