I was also curious about how the shifts revolve at Toronto center. How does one guy managed to control, say 2 + sectors at one time, then switch to one sector after another? Do these guys have one radar screen combined with mulitple sectors? I often hear ATC handling North Bay/Sudbury on 127.25, also handle Sudbury Hi-Alt on 135.5, our Cobalt sector on 128.3 and the Moosonnee sector on 133.72. Can someone help me out with this?