Easy..
Code:

IF INGROUP('GROUPA')

 USE H: '\\SERVER\SHAREA'

ENDIF

IF INGROUP('GROUPB')

 USE I: '\\SERVER\SHAREB'

ENDIF

Using the IF..ENDIF structure in this fashion will check to see if the person is a member of both, neither, one or the other..

Kent
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Utilize these resources:
UDFs (Full List)
KiXtart FAQ & How to's