Int 67 Fn 4B  - LIM EMS - Get Number Of Emm Handles                        [m]

   AH = 4Bh

Return: AH = status (see below)
   BX = number of EMM handles if AH=00h

Values for status:
 00h   successful
 80h   internal error
 81h   hardware malfunction
 83h   invalid handle
 84h   undefined function requested