Compatibility: 3.0+
See: INT 2fH 4300H (is HIMEM.SYS installed?)

INT 2fH 4310H (get XMM entry address)

XMS Functions (services available via XMM entry address)

See Also: Extended Memory Specification (XMS Overview)
DOS Protected Mode Interface (DPMI API Functions)
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INT 2fH 43xxH: HIMEM.SYS (Extended Memory Manager) Services