Windows Open Services Architecture
Windows Open Service Architecture is one of the mainstays of Microsoft Windows: the methods of abstraction of core services.
These then transparently let the operating system speak to device drivers, database managers, and other low level entities.
These extensions include, among others, ODBC (called the "crowning jewel of WOSA"), TAPI, WOSA/XFS, SAPI and MAPI, and their supporting services, as well as the abstraction of access to printers, modems, and networking services, which run identically over TCP/IP, IPX/SPX, and NetBEUI.
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