After you are checked in, you will have a seat in the hall and wait to go into Court. When the jurors are all called to go into the Courtroom, you will begin Voir Dire, which is the jury questioning process. Once Voir Dire has been completed, you will know whether or not you have been chosen to serve on the jury panel.
If you are chosen, you will serve for the remainder of the trial. If you are not chosen, you are excused until you receive another jury summons. After the panel has been chosen, you begin the trial at that time. When a juror receives a jury summons, that juror is reporting for a jury trial that is being held that day.