Int 15 Fn 1E02  - Multidos Plus - Wait For Event                           [T]

   AX = 1E02h
   DX = event/trigger number (00h-3Fh)

Return: AH = status
       00h successful
       01h invalid event/trigger number

Note:  if the event counter is zero, the task is suspended until the event is
     triggered with AX=1E01h; else, the counter is decremented and the
     call returns immediately

See Also: AX=1E00h,AX=1E01h