Hi Frederick, you can paste this into the "Command" part of a shortcut key:

script: /* Highlight naked edges */ var gd = moi.geometryDatabase; gd.deselectAll(); var breps = gd.getObjects().getBreps(); for ( var i = 0; i < breps.length; ++i ) breps.item(i).getNakedEdges().setProperty( 'selected', true );

Or also in V5 you can use the Scene Browser, click "Browser" at the bottom of the side pane and inside the scene browser go to Types> Edges > Naked and click the selection dot area on the right hand side of the item.

And yes "naked" edges are edges that belong to just one face instead of being joined between 2 faces.

You can't have a solid if there are any naked edges, so those are the areas that need some tune up work.

In your case here there are a couple of the naked edges are very tiny, these can cause joining problems.

Sometimes tiny edges can be purged by separating faces into individual surfaces so they aren't joined to anything and then using the Merge command:
https://moi3d.com/4.0/docs/moi_command_reference10.htm#merge

Sometimes it may need getting rid of the current trim boundaries and retrimming the surface. There is a description of this in the object repair tutorial here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=446.17

- Michael