When an object is live, other objects and tools automatically snap to its surface.
-click the object, and then select Make Live from the pop-up menu.

The selected object becomes a live surface and its name displays beside the Make Live icon
in the Status Line. A live surface's wireframe color is dark green, but it only displays when Wireframe or Wireframe on Shaded mode is enabled.

-click the Make Live icon
and select a previous live surface from the pop-up menu.
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