Surround : Surround Panning and Mixing : Output Windows

Output Windows
Output windows provide panning controls (called panners), as well as standard Pro Tools controls, for tracks of all mix formats (from 3-channel LCR through 8-channel 7.1).
For information on Output window standard controls, see Standard Controls. For information on Output window panning controls, see Surround Panner Controls.
Some of the features of Output windows include:
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Pro Tools target window support
Multiple panners can be opened simultaneously, or a single window can display the current panner.
To open an Output window:
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Click the Output Window button (the small fader at the right edge of the Output selector for a track in the Mix or Edit window (I/O View).