310D00 INT 31 P - DPMI 1.0+ - ALLOCATE SHARED MEMORY
310D01 INT 31 P - DPMI 1.0+ - FREE SHARED MEMORY
310D02 INT 31 P - DPMI 1.0+ - SERIALIZE SHARED MEMORY
310D03 INT 31 P - DPMI 1.0+ - FREE SERIALIZATION ON SHARED MEMORY