Int 67 Fn 54  - LIM EMS 4.0 - Get Handle Directory                         [m]

   AH = 54h
   AL = subfunction
       00h get handle directory
          ES:DI -> buffer for handle directory (see below)
       01h search for named handle
          DS:SI -> 8-byte name
       02h get total number of handles

Return: AL = number of entries in handle directory (subfunction 00h)
   DX = value of named handle (subfunction 01h)
   BX = total number of handles (subfunction 02h)
   AH = status (00h,80h,81h,84h,8Fh,A0h,A1h) (see also AH=51h)
       A1h a handle found had no name

Format of handle directory entry:
Offset Size    Description
 00h   WORD    handle
 02h  8 BYTEs  handle's name