Creating form and add it into menu (SDI)?

Hello,

I found the "Creating a form based on a string" from Inprise's TI 3197 is
very useful.
However, I want to create a form and add it into a main menu (SDI) and then
while selected the form
from the main menu, the form will show again without recreating it.

Questions:
1. How to determine to create the form or show it while not created?
2. How to add it into a menu's window option (SDI format) like MDI's window
option in the main menu?

Thanks in advance!

Best regards,

Sammy Leung