MODE <nick> <+|-><modes>

Usermodes:

     USERMODE     DESCRIPTION
-----------------------------------------------------------------
         +o     - Designates this client is an IRC Operator.
                  Use the /oper command to attain this.
         +i     - Designates this client 'invisible'.
         +g     - "caller id" mode only allow accept clients to message you
	 +x	- "Hidden Host/Vhost" means this client is using a vhost, 
                  or hidden host, and not the real host.