>Sergay,
>Thanks. I sometimes wonder if those who write documentation just don't understand what they are writing about or if they purposely obscure...

Calvin,
Just a note to give you a little more information. While LockWindowUpdate and Form.LockScreen are similar, they are not identical. In VFP, multiple forms can have the LockScreen property set to .T.; however, when locking a window using the API, you can only have one window locked at a time. Specifying a different handle when calling LockWindowUpdate results in a previously locked window being unlocked.

Regards.