Int 21 Fn 8400  - European Ms-dos 4.0 - "creatmem" - Create A Shared Memo  [D]

   AX = 8400h
   BX = size in bytes (0000h = 65536)
   CX = flags
       bit 6: zero-initialize segment
   DS:DX -> ASCIZ name (must begin with "\SHAREMEM\")

Return: CF clear if successful
       AX = segment address of shared memory global object
   CF set on error
       AX = error code (06h,08h) (see #1366 at AH=59h/BX=0000h)
Desc:  create an area of memory which may be accessed by multiple processes

Notes: shared memory objects are created as special files (thus the
     restriction on the name)
   on successful creation, the reference count is set to 1

See Also: AX=8401h,AX=8402h,INT 15/AX=DE19h