Key Decoration

I don’t know how I even invoked the command ‘Key Decoration’ but what the heck is it and what does it do?

Command: KeyDecoration
CCommandKeyDecoration::RunCommand 180717 Disable Key

Have I somehow disabled a key on my keyboard?

Hello - as far as I can see that is not a Rhino command - you may have a plug-in running which provides that. Maybe a 3dConnexion device or something?