>but my form will call the sub form and the sub form also will call
>the sub-sub form. so how to pass so many variables to sub-sub form and
>return those variables back to the top form ?

The caller form can pass itself as a parameter to the next form. The next form can have a property to keep the reference for the caller... like this:

*--form2 init
lparameteres toCaller
this.addproperty("oCaller", toCaller)

Then form1 calls the form2 like this:

do form form2 with this

and form2 can do whatever it takes to form1:

*-- some method in a control in form2:
thisform.oCaller.someProperty=this.value

Just in case, in form2.destroy:

this.oCaller=.null.