session – any number of pids
per application for the duration of one terminal group session.
Effect: All associated pids are treated
as one running application instance for that session. However, because
sessions on HP-UX and Linux are maintained per user, this has the
effect of delineating running applications per user. Thus, if you
log in twice (two concurrent terminal windows), you can have two separate
instances of this running application. This effect is similar to that
obtained by setting user scope=one.