>Oh, I see. That does present a bit of dilema. Have you tried putting your looping code for the sessions in an object and using that objects Error event to set a flag? That has a chance of working, but I haven't tried it.

well, i could not get it to work. i tried your solution - same negative result, and i tried the following:

FOR loop1i=1 TO MaxLoop
	*GotError = .F.
	SET DATASESSION TO loop1i
?STR(OldSession) + STR(SET("datasession")) + STR(loop1i)
	IF SET("datasession") <> OldSession
		* *** existing datasession
		MaxLoop = MaxLoop + 1
		ReturnValue = ReturnValue + 1
		DIME ArrayPointer(ReturnValue, 1)
		ArrayPointer(ReturnValue, 1) = loop1i
		OldSession = SET("datasession")
	ENDIF
ENDFOR

but the interesting thing is that unlike outside of my error trap, inside of it 'SET DATASESSION TO #' doesn't set didlely zip, therefor no comparing of previous and current DS. RRRRRRRRRRRRR - there just has to be a solution!