there are a couple of ways. one way i use is to pass the current form to the called form as in.

frm=create("myform",this)

in the called form's init, i have something like this

lparameters owner
if type("OWNER")="O" and !isnull(owner)
this.owner=owner
endif

and any changes i make i can just modify a property in thisform.owner.

or you can do a

do form myform to x and send the return via the myform.unload.