Paul,

Ok, here is what we got:

1) Run a program instead of calling a form first
2) Make the MAxframe api call ( which makes sure no forms are open):
IF oForms.AnyFormsInstantiated()
=MESSAGEBOX("This form must be opened in Single user mode.",64,"Please Note...")
RETURN
ENDIF
3) Close the table since you are still in the default data session at this point and there are no other forms open (by you). Then reopen it exclusive and zap it(or otherwise clear the table) and close it again. Or whatever you need to do.
4) Call the form using oForms.DoForm from the program.

This of course cannot be done in a multiuser environment, or somebody else may have the table open. Step 2 will ensure that you don't have any forms open, but you need to ensure that no other users are using the table, or your exclusive will fail. You may need to check for a lock on the table and handle the exception.

In a more general note, this may not be the best way to do this, but it will get you by your speed bump.

HTH
Bill