SolidPtOn is a misleading name for a command which works on any surface or polysurface, not just on solid objects (closed polysurfaces).
The SolidPtOn command turns on grips at the ends of surface and joined polysurface edges, including closed solids.
https://docs.mcneel.com/rhino/6/help/en-us/index.htm#commands/solidpton.htm?Highlight=solidpton
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