Autodialer always pop up new window

When I start my broadcast, a new window opens and the broadcast starts. Why?

If you start a broadcast right away, there will be no new window.

If you schedule a broadcast, there will be new window. This is necessary. For example, if you schdule a broadcast next week, and your machines have been power on/off several times, a new
instance of BroadcastByPhone (window) must be used.