Open/Close MIDI Insert 2 Plug-in Window of focused Track
Opens or closes the insert (a noun) plug-in window (toggle?) for the insert in slot 2. Currently there are only 8 inserts available for MIDI inserts, but there are 15 Open/Close commands.
I would only assign these commands to keystrokes if I was building a very task-specific workflow. I guess if I kept plug-in windows on a separate screen, and had the mouse/pointer usually on that screen, then dealing with the opening or closing of the window might make sense.