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The presence of a slide in panel is indicated by expansion images on the top, left, right and bottom edges of the web page:
As the user mouses over the edge it is highlighted, like this left edge slider:
If the user clicks or touches the highlighted edge, the slider appears:
A slider can be docked, or undocked by the user.
This Framework has a slider attached to all four edges and all four have been docked:
Slide in panels are specified using the VLF-ONE Slide In Panel Reusable Part properties.