(Windows Open System Architecture) An earlier umbrella term for a variety of programming interfaces from Microsoft designed to provide application interoperability across the Windows environment. WOSA provides a common denominator for front-end Windows applications to access back-end services. For example, any WOSA-compliant query program from one vendor can gain access to any WOSA-compliant DBMS from any other vendor. See SPI. WOSA Interface Provides Access To ODBC Databases MAPI Messaging systems TAPI Telephone services LSAPI Software licensing Windows SNA IBM SNA networks Windows Sockets TCP/IP networks Microsoft RPC Remote procedures Financial Services Banking services WOSA/XRT News, stocks, etc.