There's a shitload of tutorials on the internet, and I know there's one SPECIFIC for this function for this same game.
If you can't Google, you can't RE.
I find the function but I have a problem. I would like to communicate with the server using custom command not programmed in cod, but it causes bugs. I had a crash, or a nice r "EXE_UNPURECLIENTDETECTED." What should I do? How i can escape my command in a secure way ?