Rules on Civil Procedure
Section 2. Filing and service, defined. - Filing is the act of presenting the pleading or other paper to the clerk of court.
Service is the act of providing a party with a copy of the pleading or paper concerned. If any party has appeared by counsel, service upon him shall be made upon his counsel or one of them, unless service upon the party himself is ordered by the court. Where one counsel appears for several parties, he shall only be entitled to one copy of any paper served upon him by the opposite side. (2a)