>my program manages an hotel. and there is the main form that is used to enter informations about new customers. this form must be started at morning and still running until the night. if the operator doesn't use it during 2 hours for exemple, the form becomes inactive. they can't minimize the form, any all objects on this form can't be clicked or modified.
>in this case they use the ctrl+alt+del keys to stop the program before running it again.
>this is the problem. there is no screen saver.
>
>to solve the problem i automaticaly close the form after each use, and i think that this solution is not interesting.

I am not sure why this happens. Is it in every terminal or only that one? Sounds to me like a hardware or driver problem.

You could try putting a timer control on the form to refresh it every hour or so. This might help.