—(1) Subject to this Rule and Rules 2 and 7, the Court may at any time order any party to a cause or matter (whether begun by writ, originating summons or otherwise) to give discovery by making and serving on any other party a list of the documents which are or have been in his possession, custody or power, and may at the same time or subsequently also order him to make and file an affidavit verifying such a list and to serve a copy thereof on the other party.
(2) The documents which a party to a cause or matter may be ordered to discover under paragraph (1) are as follows:
the documents on which the party relies or will rely; and
the documents which could —
adversely affect his own case;
adversely affect another party’s case; or
support another party’s case.
(3) An order under this Rule may be limited to such documents or classes of documents only, or to only such of the matters in question in the cause or matter, as may be specified in the order.