MIDI : MIDI Editors : MIDI Editor Window Toolbar : Target

Target
Generally, the Target button for MIDI Editor windows functions just like the Target button for Plug-In, Output, and Send windows. Additionally, the Target button in a MIDI Editor window synchronizes its Timeline location view to the Timeline location view in the Edit window. Any changes to the Edit selection in the Edit window are reflected in the Targeted MIDI Editor window. There can only be one targeted MIDI Editor window at a time. The targeted MIDI Editor window can also be stored in a Window Configuration.
One or more untargeted MIDI Editor windows can remain open and available at the same time, just like untargeted Plug-In windows. Targeting an untargeted MIDI Editor window disables any other targeted MIDI Editor window.
The front-most window, regardless of whether it is targeted, always receives Keyboard Command focus and control surface focus.
To enable or disable the Target for a MIDI Editor window:
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Click the Target button for the MIDI Editor window so that it is highlighted (targeted) or unhighlighted (untargeted).