If you're usign adminmod, you can use admin_rcon, saves messing arround with rcon_password, and getting banned if you get it wrong. (That's happened to me before, but fortunatly I have access to the server to undo it.)
You can also bind a key to it in config.cfg in your DoD game folder:
Code:
bind "I" "admin_messagemode admin_rcon"
Then hit I in game, and type the command exactly as if you were sitting at the server console.
Of course, it wion't work if you're only using AMX mod, but I'm sure there's similar functions in there.