Notice to produce documents, summonses to witnesses, and every other judical process, issued in the exercise of the original civil jurisdiction of the High Court, and of its matrimonial, testamentary and intestate jurisdictions, except summonses to defendants, writs of execution and notices to respondents may be served by the attorneys in the suits, or by persons employed by them, or by such other persons as the High Court, by any rule or order, directs.