INT 15 - DESQview v2.23+ - "DOSUSER" - GET HANDLE OF TASK CURRENTLY USING DOS
	AX = DE1Fh
Return: BX = segment of task handle or 0000h if no tasks are using DOS
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 within a hardware interrupt handler
SeeAlso: AX=DE13h,INT 21/AH=34h