INT 69 - ISR.COM v1.00 - SPECIFY INTERRUPT HANDLER                              
	AX = 6996h
	DS:DX -> interrupt handler or 0000h:0000h to disable
Return: AX = 9669h
Program: ISR (Interrupt Service Reflector) is a TSR(Terminate and Stay Resident) A program which remains in memory after terminating in order to provide services to other programs or the user.  The name comes from the name of the DOS function call used to remain in memory after termination. by Rich Bono which permits
	  a program to provide hardware interrupt handlers even while being
	  debugged with a debugger that swaps interrupt vectors during
	  debugging.
Note:	the interrupt vector which is to be reflected is set at installation
	  time and cannot be changed