Process to enforce a judgment for the payment of money shall be a writ of execution, unless the court directs otherwise. The procedure on execution, in proceedings upplementary to and in aid of a judgment, and in proceedings on and in aid of execution shall be as provided by law. In aid of the judgment or execution, the judgment creditor or his successor in interest when that interest appears of record, may also obtain discovery from any person, including the judgment debtor, in the manner provided in these rules.