>Can I determine if there is no user activity using native FoxPro code ?
>I need to shut down the app if there is no user activity for 10 minutes.

You can have timer fired each 10 minutes which will evaluate property-flag and close app if its value is not changed. You can reset the property value in:
1. Form.KeyPress event having Form.KeyPreview=.T.
2. All controls GotFocus events trapping mouse clicking.