Calling a Function on a subform from the Main Form (Round II)

Hi All,

I asked how to do this some time back, and got a response from Allen
Browne, explaining (in part):

If the subform is name Sub1, and the procedure is named Text0_AfterUpdate,
you can then call it like this:

Call Form_Sub1.Text0_AfterUpdate


I 've been doing this and everything works fine. Every so often, I
get a sick desire to understand what's happening under all the comfy layers
I usually stay above.

In this case, when I make a call like the one above, how would Access
know that I wanted the instance of Form_Sub1 that is a child on the main
form making the call? I think this has worked so far because I never have
more than one instance of any given form open at a time.

Allen also suggested that the function being called be moved into a
standard module, then passed a reference to the form I want to work done
by. I can see how that would fix things.

In search of a calling convention that would properly resolve to the
child form's function, I tried, "Call Forms!frmMain!
fsub_Child.Form.FuncCall", where fsub_Child is the subform's control name.
It didn't work, but I'm sure those of you in the know could have told me
that it wouldn't.

Is there a syntax that I could use to call the child form's function
specifically?

Regards,
Max