This means that you have successfully recorded data for all programs run in a session and the session has ended by default. Client names appear in the "End Session" list when data has not been recorded yet (i.e. the Record Data button has not been selected). Leaving a program before recording the data will lock the program so that no other user can run it; use the End Session button to unlock the unfinished session so that another user can add data. Administrators can also unlock programs from the "Run Program" page.
Tutorial video: End Session Button
Tutorial video: Locked Programs
Tutorial video: Unlocking a Locked Program