snap-to-wireframe-data-switch ("stpw")
See this command in the command table.
To access this command:
- 
                                                    Home ribbon >> Snapping >> Snap To>> Wireframes. 
- 
                                                    Use the quick key combination "stpw". 
- 
                                                    Using the command line, enter "snap-to-wireframe-data-switch". 
- 
                                                    On the Find Command screen, highlight snap-to-wireframe-data-switch and click Run. 
Command Overview
Enable or disable snapping to wireframe data in a 3D view. Wireframe snap points coincide with vertex positions, not triangle edges.
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