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SSH Tunneling - Port Fowarding

Say  you are in a network that bnlocks all the ports http, telnet, irc port, torrent, etc. They only leave SSH port open for connections.

use ssh to connect to a computer you have somewhere , and ssh -l will tell that machine to forward (tunnel your packets)
    tester@laptop:~$ssh -L
Thsi will command laptop's ssh to direct any localhost:1234 packets to home's ssh, it will also command home's ssh to forward these packets (only the ones from 1234?) to the irc channel, and bring back the packets to us mentioning port 1234 as destination