rednet monitor

rednet.open("back")
while true do
 m=peripheral.wrap("left")
  m.clear()
  m.setCursorPos(1,1)

 event, 237, plaz = os.pullEvent()
 event, 237, alt = os.pullEvent()
if plaz == rednet_message" then
 m.write("Plazter has entered the cave!")
end
if alt == "rednet_message" then
 m.write("AlternateLogic has entered the cave!")
end

end