Int 21 Fn 8401  - European MS-dos 4.0 - "getmem" - Obtain Access To Share  [D]

   AX = 8401h
   CX = flags
       bit 7: writable segment (ignored by MS-DOS 4.0)
   DS:DX -> ASCIZ name (must begin with "\SHAREMEM\")

Return: CF clear if successful
       AX = segment address of shared memory global object
       CX = size in bytes
   CF set on error
       AX = error code (invalid name)
Desc:  get address of a previously-created area of memory which may be
     accessed by multiple processes

Note:  this call increments the reference count for the shared memory area

See Also: AX=8400h,AX=8402h