function serverCmdCommand(%client,%whatever){
Whatever your function does
}
serverCmdCommand is /Command.
The %client is needed, but after that, its your choice what to use. For example:
function serverCmdSay(%client,%message){
messageAll('',%message);
}
That would make the command /say, which you would use by going "/say words" and it would message those words to everyone.
I might have done the messageAll wrong ._.