Cheat Engine

[onlyus]

SetDebugPrivilege(True);
hEvent:= OpenEvent(EVENT_ALL_ACCESS, False, 'SomeEvent');
hProcess:= OpenProcess(PROCESS_DUP_HANDLE, False, PID);
DuplicateHandle(hProcess, hEvent, GetCurrentProcess, @CloneMutex, 0, False, DUPLICATE_CLOSE_SOURCE);
// CloneMutex Result 0
CloseHandle(CloneMutex);
CloseHandle(hEvent);
CloseHandle(hProcess);
SetDebugPrivilege(False);

not work.. why????

[Dark Byte]

debug it and find out what doesn't work first

Also, what do you think/assume will happen?

From what I see:
hEvent is a handle in the context of the calling process
DuplicateHandle tries to access a handle in the target process with the same value as hEvent, which does not mean that the event has the same handle value in the target process, so fails