How to record demos and report players

[Mr. Robot]

To record a demo, firstly open the game and join a server if you haven't already.
Open the console with the ` (UK keyboards) or ~ (USA keyboards). It's the key to the left of number 1, and above the TAB key.

Start recording by typing:
record filename
Replace the word filename with the name of the file you want to save the demo as (do not put .dem at the end, this is done for you). If the filename already exists it will be overwritten without warning!

The demo should be named in relation to it's contents, like name-incident. Some examples are:

mojo-blocking
gore-aimbotting
harrison-killing-alies
jusupov-voice-spamming
lelelelcrimstahastopscore!!!!.dem has no meaning. Use a sensible filename.

Once you submit the command, recording will begin. Everything you see and hear is recorded, along with what happens in the console.
The first thing you should do now is type status in the console. This will put a list of the players in the console, so whoever is going to watch the demo can find out exactly who is present.

Be sure to clearly watch the person who is causing trouble, but do not make it too obvious. When you think you have enough footage, open the console and type stop to end recording. You will be notified that the demo has finished recording.

(originally from http://forums.chenzen.org/showthread.php?tid=41)