J S B wrote:
What exactly is this LISTEN/NOTIFY?
Is it some function in socket programing or some part of postgres?

~Jas

Listen/Notify is a means of letting a connected postgresql client know a insert or other event has occurred. It won't help if you need to send a command/message to some other tcp/ip daemon.

You set up a rule to use Notify:

create rule InsertDetect as on INSERT to notify_test do notify recinsert

Then on the client side (if the client has libpq listen capability) you listen for the incoming notification messages and react to them
accordingly.

--
Tony Caduto
AM Software Design
http://www.amsoftwaredesign.com
Home of PG Lightning Admin for Postgresql
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