In Left 4 Dead 2, how do I join a server by IP?

My friend was playing some 10v10 on L4D2 the other night, I did a search of google and found a bunch of IP addresses for these 10v10 servers, but how do I join them? There is nowhere in game to enter an IP or anything like that.

Thanks!

PS: 10v10 is awesome

Solution 1:

It is possible to join by IP, you're going to have to use a feature called the Developer Console. You can find it under Keyboard Settings. Enable the Developer Console feature there.

Then, when you want to join a server, press the ~ key, that's usually the key next to 1 on your keyboard and enter connect <IP> into the prompt, for example connect 123.45.6.7. You'll then join the server.