Windows Sockets 2, with its expanded scope, takes the socket paradigm beyond the original design. As a result, a number of new functions have been added. These have been assigned names that begin with "WSA." In all but a few instances, these new functions are expanded versions of existing functions from BSD sockets.
The new functions are described in the reference section of the document, following the conventions of the Platform SDK. The new functions are also listed in Summary of New Functions.