Int 21 Fn B5  - Novell Netware Shell 3.01 - Task Mode Control              [N]

   AH = B5h
   AL = subfunction
       03h get task mode

       Return: AH = 00h
           AL = current task mode byte
       04h get task mode pointer

       Return: ES:BX -> task mode byte

Notes: the task mode byte specifies how task cleanup should be performed, but
     is declared to be version-dependent
   allows a program to disable the automatic cleanup for programs managing
     task swapping, etc.

Values for task mode byte in version 3.01:
 00h-03h reserved
 04h    no task cleanup