Avi
I am not really up to speed with Excel User forms and their functionality or
the scope of what can be done within them.
How about a user form, I have an idea, although it has potential for
pie-in-the-sky as I am not sure if it is fundamentally correct.
When said userform is opened~activated, the attached Listbox / combobox
looks for all opened~active workbooks then compiles and displays a list for
you to select from.
You could then have a series of other boxes to do whatever it is you are
hoping to do, eg insert something into a specific cell or range or something
to that affect.
Something to ponder.
HTH
Mick.