The Windows Sockets SPI uses the following function prefix naming convention:
WSP (Windows Sockets Service Provider) - transport service provider entry points
WPU (Windows Sockets Provider Upcall) - WS2_32.DLL entry points for service providers
WSC (Windows Sockets Configuration) - WS2_32.DLL entry points for installation applets
NSP (Name Space Provider) - name space provider entry points
As described above, these entry points are not exported (with the exception of WSPStartup and NSPStartup), but are accessed via an exchange of dispatch tables.