Since starting the thread, the following seems to work

In the Deactivate() event put:-

lcTestData = [f^3!gy&ip*2]

In the Activate event put:-

IF UPPE(ALLT(lcTestData)) # UPPE(ALLT(_CLIPTEXT))
lClipBoardChanged = .T.
ENDI

What I was forgetting was that EMPTY(_CLIPTEXT) = .T., if other than text was copied to the clipboard.

By providing lcTestData with a string value unlikely to be pasted from any other application, it tests not only text changes but also if a graphic was copied to the clipboard.

Thanks for your help, Hilmar

Dennis