How to play multiplayer on CoD 4 MW: 1 - copy a cracked server's IP Address into the clipboard 2 - start the game 3 - select multiplayer 4 - press the ` key (right under escape on macbook pro) 5 - type 'connect' and then space 6 - paste the IP Address into the console 7 - press enter Serial Number: MEGQ - 8YW4 - 2JED - M4UG - CB11