@hawhill: Yes, I think there is an answer hidden in there, somewhere.
@CaptainDerya:
If you have re-purposed a touch event to trigger your application, then you will also have to support its original function in your application (or application launcher).
Review the threads/posts on how the visible application depends on the window title.
You should be able to switch which of two windowed applications are visible by manipulating the window titles on the stack.
But as others have posted, handling the side effects of that switching might get a bit hairy.
(Hmm... That might not translate very well, but it is descriptive in English.)