How to mask parts of a 3D model

It is often necessary to mask a part in front of an object one wants to select. With the cursor of the mouse on the part to mask, the TAB key will render the part in Ghost mode. The outline of the Ghost part will remain visible, but it will no longer be able to be seelcted. Once the cursor is moved out of the zone, the part(s) will automatically reappear. By using TAB, one can temporarily mask as many parts as necessary.
Since v4.3, if user presses K key, then masked part will stay ghosted.
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