WindowsXP tcp stack - interception and modification

Hi Group,

Does anyone know anything about NDIS and intercepting the Windows XP tcp stack?

I don't expect anyone to give me chapter and verse code but can anyone advise me on the method to use to add an IP4 option to every IP datagram which leaves my client computer?

If anyone has any knowledge of the method used by such apps as ZoneAlarm (which identifies the client app as well) I'd be grateful for an online chat.

FYI: I already own the Microsoft SP3 DDK - before anyone asks and - yes - I have scoured many BB's and the Internet for Microsoft stack-related programming! Useful data is in very short supply and it's proving almost impossible to locate Microsoft-specific technical advice.

Here's hoping ..............

Think it through first - then pester someone.
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