the winsock stuff is made by curl_global_init

                                    Updated for curl 7.9.1 on November 2, 2001

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 2. Windows requires a couple of init calls for the socket stuff.

   Those must be made by the application that uses libcurl, in curl that means

   src/main.c has some code #ifdef'ed to do just that.

   That's taken care of by the curl_global_init() call, but if other libs also

   do it etc there might be reasons for applications to alter that behaviour.

 3. The file descriptors for network communication and file operations are

    not easily interchangable as in unix.