Int 31 Fn 0D00  P - Dpmi 1.0+ - Allocate Shared Memory                     [E]

   AX = 0D00h
   ES:(E)DI -> shared memory allocation request structure (see #2830)

Return: CF clear if successful
       request structure updated
   CF set on error
       AX = error code (8012h,8013h,8014h,8016h,8021h) (see #2814)

Note:  first 16 bytes of memory block will be initialized to zeros on the
     first allocation

See Also: AX=0501h,AX=0D01h,AX=0D02h

Format of DPMI shared memory allocation request structure:
Offset Size    Description (Table 2830)
 00h   DWORD   requested length of shared memory block in bytes
 04h   DWORD   (ret) allocated length of block
 08h   DWORD   (ret) shared memory handle
 0Ch   DWORD   (ret) linear address of memory block
 10h   PWORD   selector:offset32 of ASCIZ name for memory block
       (name max 128 bytes)
 16h  2 BYTEs  reserved
 18h  4 BYTEs  reserved (00h)