I'm attempting to add functionality to maintain user sessions across a
very large site. The servers are IIS5. I'd use the MS session object
and cookie Munger if it weren't for the fact that the site is load
balanced.

I end up therefore with the prospect of rewriting every link with
?sid=xxxx etc, and perhaps more importantly making sure all future
links are correctly coded in this way.

What would seem to make most sense to me is to create an isapi filter
which reads the id out of a header/meta tag (which could be part of an
included file) and then rewrites all relevant on page links at the
onsendrawdata event.

Obviously before embarking on getting this written, I've been looking
around to find if someone else has already done it. Although Link
Freeze operates a similar outbound content filter, it does not do it.
It seems such an obvious approach that I'd be amazed if noone's done
it before?

Can anyone find it?

Many thanks