INT 15 - DESQview - "APPNUM" - GET CURRENT PROGRAM'S NUMBER
	AX = DE07h
Return: AX = number of program as it appears on the "Switch Windows" menu
Note:	this 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. call may be made from a hardware interrupt handler
SeeAlso: AX=DE00h