How to make an automated password change for a windows user? Windows 2003 Server

Here is the situation.We are running terminal services and it has now come neccesary for us to allow the user to actually log onto the local machine. We now have made it so that when the machine turns on, it boots into the terminal session, nerver allowing the user to see the local machine. Now with us needing a "generic" local user, we need a way to make this user with a password that changes automatically & random.

It is a school enviroment and only students with permission, by the teacher, to get on the local machine will need to know the password. Idealy i would like for there to be a generic user, thats password changes automatically, and is emailed to the teacher upon its change. I did not know if someone else has done this before. Is there a way to make automated password changes? Is there the ability to set a password change time increments?

Thanks for the help ahead of time.