The trial court did not abuse its discretion in excluding plaintiff’s principal officer from the courtroom during the portions of the trial in which the technical details were discussed regarding Yelp’s software for filtering out unreliable reviews.  The officer was an experienced programmer who had previously managed to circumvent Yelp’s software and might do so again.  Though a party, he had no absolute right to be present throughout the trial, and the trial court allowed plaintiff to be represented by both its attorney and an expert witness.  Also, plaintiff failed to show how it was prejudiced by the exclusion of its officer from the courtroom for those portions of the trial.  A party has no absolute right to be present throughout a civil trial.