How does this fail? Error message?
I noticed the comment about overriding the Nagle algorithm. To override set socket option TCP_NODELAY (beware that this is a bad idea if you are already getting lots of collisions, since it increases the number of packets).

In reply to Re: TCP/IP non-blocking socket under Windows XP Pro by cdarke
in thread TCP/IP non-blocking socket under Windows XP Pro by LittleGreyCat

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