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INT 21 - European MSDOS 4.0 - "GETMEM" - OBTAIN ACCESS TO SHARED MEMORY AREA
        AX = 8401h
        CX = flags
            bit 7: writable segment (ignored by MSDOS 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
SeeAlso: AX=8402h

See Also: 218400
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