Sliding windows have two sashes -- one fixed, one movable. The sliding part can move either vertically or horizontally.
The topic for each kind of Window describes its unique controls and behavior. Most Window parameters are common to all kinds of Windows,see Windows
Width: Sets the width of the rails in the sash.
Horiz. Divisions: Sets the number of horizontal divisions in each sash.
Vert Divisions: Sets the number of vertical divisions in each sash.
Chamfered Profile: Check this to chamfer the rails between the glazed panels, as in a conventional wooden window. When not checked, the rails have a rectangular profile.
Vertical Rotation: Check this to switch from a horizontal pivot to a vertical pivot.
ung: When selected, the window slides vertically, when clear, the window slides horizontally.
Open: Specifies the percent that the window is open.
Generate Mapping Coords: Assigns mapping coordinates to the window.
For an explanation of how to create a Window, see Windows