Guardian Procedure Calls Reference Manual

If processes are running in different processors, they can share a segment only if the security
requirements are met and the segment is a read-only segment.
Callers of [CHECK]ALLOCATESEGMENT can share segments with callers of
SEGMENT_ALLOCATE_[CHKPT_]. High-PIN callers can share segments with low-PIN callers.
• Sharing flat segments
A process cannot share a flat segment with a process that allocated a selectable segment,
because the segments reside in different parts of memory. (Similarly, a process cannot share
a selectable segment with a process that allocated a flat segment.)
CHECKALLOCATESEGMENT Procedure (Superseded by SEGMENT_ALLOCATE_CHKPT_ Procedure) 131