Wann wird fremde TForm ausgeblendet

[Kas Ob.]

From the video, i think i do understand the question, so here a suggest with different approach :
Replace BorlndMM.dll with one that load (just an import of one function might be enough) another DLL (yours) in this case BorlndMM.dll still serve as memory manager, but will invoke your dll before even the IDE start, don't forget to make your injected dll is not using share memory.