To record a demo, open the console (~) and type /record
and press enter
this will record whatever you see on your screen at the time.
if you want to name the demo, put a space after record and whatever name you want, such as /record XYZ
to stop recording, type /stoprecord
and press enter
to find your demo, go here:
C -> Users ->Your name-> App Data -> Local -> Virtual Store -> Program Files -> Activision -> Call of Duty 4 Modern Warfare -> main -> demos ->
near the end, the location may vary, but the game folder will be in this general location. if you are in a modded server, find the mod folder in this location for the server you were on.
if you want to watch your demo, open COD4, load the mod you recorded it in, open the console, and type /demo (and whatever it is named)
such as /demo XYZ