>By "passing the object reference" do you mean to do something like this...
>do form Form2 with Form1

Close, you can pass a reference of Form2 to Form3 like this:

do form Form3 with thisform

Then in the Init() of form3, trap the parameters and save it for future use:

lparam loform
this.addproperty('oForm2', loForm)

Now to refresh() form2, do:

Thisform.oForm2.Refresh()

Make sense?