I think you need a pager that supports e-mail paging. In my last company some people had them, and you could write scripts that would send an e-mail to the pager, and get it any-time any-place.
Here's a node that sends an e-mail to a pager when a webpage changes: Ebay, my pager and my dad

I hope I have not mis-understood your post. If in fact you were refering to paging, like sending some sort of instant message, try Net::AIM, and an example AIM Offline Messaging Bot or Power Failure Notify via AIM.

After a little more searching I found Power Failure Notify via IRC, and there he uses Net::IRC and mentions using net::msn, but I could not find it at CPAN.
Good luck!

Update: Teach me to take too long to post!