How to intercept data on Internet? This can be done using number of technologies:

• Winsock LSP – Is good when you want to operate at user level and inspect streams and not packets.
• TDI – Soon to be phased out, it’s a driver like technology that can be used either in packet or stream level.
• NDIS – Kernel driver that inspects packets and has total control over the network.
• WFP – Microsoft new filterting platform, but until Windows XP is phased out, I forsee it will not gain momentum.

Barak