Projected windows have three sashes: The top sash doesn't move, while the bottom two sashes swing open like awning windows, but in opposite directions.
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Create panel > 
(Geometry) > Windows > Object Type rollout > Projected button
Projected window
For using materials with doors, see Doors and Materials.
Interface
Parameters rollout
The topic for each kind of window describes its unique controls and behavior. Some window parameters are common to all kinds of windows; see Windows.
Rails and Panels group
- Width
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Sets the width (depth) of the rails in the sashes.
- Middle Height
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Sets the height of the middle sash, relative to the window's frame.
- Bottom Height
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Sets the height of the bottom sash, relative to the window's frame.
Open Window group
- Open
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Specifies the percent that the two movable sashes are open. This control is animatable.