Int 0B  P - CPU-generated (80286+) - Segment Not Present                   [C]

Desc:  generated when loading a segment register if the segment descriptor
     indicates that the segment is not currently in memory, unless the
     segment is an LDT (see INT 0A"CPU") or stack segment (see
     INT 0C"CPU") needed by a task switch

Note:  may be used to implement virtual memory by loading in segments as they
     are accessed, clearing the "not present" bit after loading

See Also: INT 0A"CPU",INT 0E"hardware"