This is a simple text file that is updated by ds_redbutton.pl whenever the user changes the station availability. If the value of override is true then the antenna is considered to be unavailable and the scheduling software will exclude it. dysched.pl also reads this file and will not download a schedule from the server if override=true. If ds_redbutton.pl is not in use or if a user wants to change the antenna status manually, then this file can be edited by hand to start and stop participation in a dynamic observing session.