>Dear all,
>
>how can I tell when a user clicks on a minimumised appliaction, so I can tell the app to do some processing, but remain minimumised.
>
>Thanks

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Simiarly question in UT, check maximize application and take action.
I hope this help:

DEFINE CLASS ScreenHook AS CUSTOM
oScr = _SCREEN
PROCEDURE oScr.Resize()
    * Code here to handle resize of _SCREEN
    IF _SCREEN.WINDOWSTATE = 1 && minimize
       * your background task code here
    ENDIF
ENDPROC
ENDDEFINE

_SCREEN.NewObject("oSreen", "ScreenHook")  && VFP 5 use AddObject

An other silly way is to make a Timer, Check _SCREEN.WINDOWSTATE every min.