Clicking on any track while in Describe mode will print a description in the Status Bar.
Clicking on a Note will display the Note Editor dialog to let you read or modify the note. A circle is drawn around the note to show you which note is current.
Most commands return to Describe mode then they terminate unless the command is sticky.
Note: the Default Command radio button on the Preferences dialog controls whether the Describe or the Select command is used as the default command.