INT 15 - TopViewTopView, DESQview, TaskView, OmniView, other compatibles - "OSTACK" - SWITCH TO TASK'S INTERNAL STACK
	AX = 101Ah
Return: stack switched
Notes:	this call may not be nested; a second call must be preceded by a call
	  to "USTACK" (AX=1025h)
	while TopViewTopView, DESQview, TaskView, OmniView, other compatibles requires many 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. calls to be executed while on the
	  task's internal stack, DESQview allows those calls to be executed
	  regardless of the current stack
SeeAlso: AX=1025h