In bases of jurisdiction and interstate and international procedure, further providing for assistance to tribunals and litigants outside this Commonwealth with respect to service and for issuance of subpoena; in commencement of proceedings, further providing for authority of officers of another state to arrest in this Commonwealth; and, in detainers and extradition, further providing for definitions, for duty of Governor with respect to fugitives from justice and for presigned waiver of extradition.