All the computers where I work have the same basic configuration, and users don't have access to change them.   One annoying detail is that the computer hibernates after 15 minutes of inactivity and then requires me to log back in with a username and password.
I am looking for a utility that will generate random keyboard activity to keep this from happening.  In the days when Internet dial-up services would log-off after a certain number of minutes of inactivity, I recall there were utilities that generated random keyboard input to keep you logged on.   I think that would help with my problem.   Does anyone know of such a utility?

I found the answer to my question.  Apparently other organizations have the same annoying security practices as mine.   Anyway, a simple utility called Delayer can be used to send a ping that counts as keyboard activity.

http://www.annoyances.org/exec/forum/winxp/1191334602