OPEN SYSTEMS ADDRESSING
This Appendix establishes the policy for the management and use of Open Systems Network Service Access Point (NSAP) addresses and X.400 Message Handling System (MHS) Originator/Recipient (O/R) names within the United States Department of Agriculture (USDA).
Open systems utilize hardware and software based on industry standards that allow interoperability among the equipment of different vendors. To permit interoperability, each component in an open system must be uniquely identified with an assigned address that is in accordance with a national or international standard. The address is a coded label assigned to an object, device, or item of data to identify its location or to designate the originating and receiving terminals for data transmission purposes. Generally, names are the addresses assigned to electronic mail or message handling systems users.