TRIGGER Question

gabriel <gabriel@workingnetsp.com.br>

From: "gabriel" <gabriel@workingnetsp.com.br>
To: pgsql-hackers@postgresql.org
Date: 2001-08-03T11:59:21Z
Lists: pgsql-hackers
Hello all

Anyone knows if there's a way to point a trigger 
to a external program file?

How??

thanks...