Standalone with extra stacks

[Barry Levine]

This may sound strange but I've only been developing single-stack 
standalones. I've used text files to store various params.

I now have to create a three-stack solution; at least, I think three 
stacks is the proper design. I'd appreciate any advice  regarding the 
project as I describe it below:

Stack #1: Splash screen containing the standalone engine. No changes to 
this stack once it's compiled.

Stack #2: Sign-in stack containing a few buttons and a field. The 
buttons contain the code that adds/deletes user names to/from the 
field. Other code in the buttons will also create/delete folders named 
for each user.

Stack #3: The "business" part of the program containing a number of 
cards. Each card contains a few QT Player objects and the code 
contained in the stack (and/or buttons in the stack) will permit the 
user to link to photos or movies on the local hard drive.

This all seems quite straightforward to me except for one thing (which, 
as I indicated above, I've never done): What is the Transcript code I 
would use to call Stack #2 from Stack #1 and close Stack #1's window so 
it's not seen for the rest of the program?

Would this work?:

open stack "stack #2"
close stack "stack #1"

...or would this simply exit the program?

Should I just hide the window of Stack #1 (which is the standalone)?

As always, advice is gratefully appreciated.

Thanks,
Barry