action=pset with multiple instances of tool (14 Sep 2012)
Each instance of a tool in the history is acted on when action=pset.
unix% dmhistory evt.fits acis_process_events action=pset
Each instance of acis_process_events in the above example will be pset; the last instance will be the final parameter settings.
As the parameter of any tool may have changed, this may lead to warning messages about parameter mis-matches and may miss or skip new parameter.