An application is required to perform a successful
InetInitialize call before it can call any of the other
library functions. When it has completed the use of library, the
application must call InetUninitialize to allow the library
to free any resources allocated on behalf of the process. Any
pending blocking or asynchronous calls in this process are canceled
without posting any notification messages, and all sockets that
were opened by the process are closed.
There must be a call to InetUninitialize for every
successful call to InetInitialize made by a process. In a
multithreaded environment, operations for all threads are
terminated.