Calling Mainmenu.w from a Progress program

I have a programming question for which there may not be an answer.

Calling the Vantage program mainmenu.w from another progress program,
and then applying a Quit statement from the calling program, works.

I would like the calling program (hidden in the background) to
continue processing a loop with a wait-for pause x, while the Vantage
user goes about their business.

Tests so far leave the calling program running, but the loop with
wait-for has been exited. I've tried the Run Asychronous command but
evidently haven't yet mastered it.

Humbly, I reach out to the Progress 'Old-Timers' for guidance.