if c:getState() == adchpp.STATE_NORMAL then

		--// TODO: onINF listener must be called before saving the changed nick
		--// TODO2: onINF listener shoud exist :P

		if #cmd:getParam("NI", 0) > 0 then
			-- Changing nick
			local user = adch:getUser( c:getSID() )
			if user then
				local oldnick = user:getNick()
				local newnick = cmd:getParam("NI", 0)
				
				-- Testing if the user is registered
				local cid = c:getCID():toBase32()
				local isregistered = get_user( cid, oldnick )
				if isregistered then
					-- user is registered, update his registration. update_user verifies if the new nick is taken
					local fine, msg = update_user(isregistered, cid, newnick)
					if fine then
						-- also update the userinfo table stored in the memory
						user:setNick(newnick)
					else
						-- dump(c, adchpp.ERROR_PROTOCOL_GENERIC, msg)
						user:sendSta( msg, "1", "22")
						return command_processed
					end
				else
					-- user is not registered, allow him to take only non-regged nicks
					local nicktaken = get_user( nil, newnick )
					if nicktaken then
						--dump(c, adchpp.ERROR_PROTOCOL_GENERIC, "You supplied a nick which is already registered. Please choose another one.")
						user:sendSta( "You supplied a nick which is already registered. Please choose another one", "1", "21" )
						return command_processed						
					else
						user:setNick(newnick)
					end
					
				end
			end
		end
		return 0
	end