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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
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