>I have a background menu form ("frmMenuMain"). When I DO the "frmCustomer"
>and from within "frmCustomer", I'd like to set a property which belongs to "frmMenuMain"
>
>How can reference/set a property of another form from within another modal form which is active?

do frmCustomer with ThisForm

in the 'frmCustomer' form init you then have a pointer to the calling form

LPara ;
   CallingForm

CallingForm.CallingFormPropperty = NewValue

hope this helps