INT 83 - JM Pro Tracker v5.0 - UNHOOK API(Application Program[ming] Interface) The defined set of calls which a program may make to interact with or request services of the operating system or environment under which it is running.  Because the inputs and outputs of the calls are well-defined, a program using the API can continue using the identical calls even if the internal organization of the program providing the API changes. INTERRUPT
	AH = 17h
Return: CF clear if successful
	CF set on error (hooked by another program)