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Code injection (SetWindowsHookEx, WH_CBT) and API hooking allows to filter out other programs requesting topmost display.

But this is intrusive. And it can be bypassed by other vendors, whether they workaround it by using other APIs/tricks or unhook their own process' APIs at runtime themselves.

As said here in this thread, the only way to ensure full control is to patch the kernel (Window management related syscalls). And even there it's tricky to be exhaustive.

VM is the safe way to go.




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