Turns selection cycling on and off.
When selection cycling is turned on, you can roll over overlapping objects and then press SHIFT+SPACEBAR to cycle between the overlapping 2D objects, and then click to select the one you want. For 3D solids, press Ctrl and click to cycle between subobjects such as edges and faces. Press CTRL+W to turn selection cycling on an off.
When SELECTIONCYCLING is set to a negative value, selection cycling is turned off, but the setting is stored.