> How can one determine if TCP port is already in use, before I 
> startup the SocketServer.

I see only two solutions:

1 - open the socket and check for an error.

2 - use the IP Helper GetTCPTable API to list all open TCP sockets and
emunerate the list to see if your IP and port is in it.  On a busy server
there may be hundreds of open connections. 

Angus

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