>I thought something like instantiating an APP object, raise an event via RAISEVENT that does READ EVENTS. since it is called by an event, the main.prg should proceed and the APP object stuck in READ EVENTS.

That is similar to my idea of external process creating a form, hooking it up besides normal memory perhaps cleaned by clear and starting an event loop. See my post to Dragan for easier ways - giving answers to the theoretical question not relevant to Dmitrys use case the OP sprang out of ;-)
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>Elbflorenz is optimistic gray

Like part of the additional Corona filter I have grown beneath nose and chin lately