Trigger to spawn process?

["David Busby" <busby(at)edoceo(dot)com>]

List,
    I've got my PG7.3 smoking right, but I need to have a trigger (for
update) that will then "fork" off and run a PHP script (PHP CLI is awesome)
that does some stuff.  How is that done?  I also need to send the
information about updated row or rows to my script?  If I make this trigger
then what will happen on a large update?  Does the trigger get called once
for each update? or does it go once at the end?  Thanks!!

/B