INT 15 - TopView - "STOP" - STOP TASK
        AX = 101Dh
        ES = segment of object handle for task to be stopped
             (== handle of main window for that task)
Return: indicated task will not get any CPU time until restarted with AX=101Eh
Note:   once a task has been stopped, additional "STOP"s are ignored
BUG:    in DV 2.00, this function is ignored unless the indicated task is the
          current task
SeeAlso: AX=102Bh,AH=12h"VMiX",INT 21/AH=81h