> Is there an easy and simple way to know from inside the trigger that
> it's been fired by a P.L. action and not a normal update?

Setup your own LockSQL for the query that assigns a "flag" value to
some field (and remember to reset it in your trigger). Do NOT include
that flag field in the standard select - so it wont be set by the
default edit.

--
Geoff Worboys - TeamIBO
Telesis Computing