INT 0B P - CPU-generated (80286+) - SEGMENT NOT PRESENT
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
SeeAlso: INT 0E"hardware"