>What determines the order of the Forms Array? Example:
>
>1: Form1
>2: Form2
>3: Form3
>
>and if I open a new form, Form3 moves to the 4th element and the new form goes to the 3rd element.

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Mike,
AFAIK they're enumerated by their activation order, LIFO style, last in first out.
do form form1
do form form2
do form form3
do form form4

forms(1) = form4
forms(2) = form3
forms(3) = form2
forms(4) = form1

Click on formN (or show-activate) and it becomes forms(1), others are pushed in stack till formN's old position is filled. That's if you call :
_screen.forms(3).show

forms(1) = form2
forms(2) = form4
forms(3) = form3
forms(3) = form1

Other than providing a way to know form visit order I don't know how could it be reliable (thanks all collections don't behave same :).
Cetin