The first step to snooping is to examine the temporary internet files which can be found by going to c:/windows/system/temporary internet files or c:/windows/temp

This gives you a good idea where people have been on your computer.

Another good way to track useage is to use a KEYSTROKE LOGGER!!

You can download a shareware version here which will let you record the first 500 keystrokes each time the computer starts.

Or click here for more detailed info on user an applications