user identification

Hi all,

We have about 10 different domains that are linked very closely and we
want to identify and track every single user that surfs our websites.
Later we want to analyse user paths and find out the search robots with
the referring search words.

What are the possibilities?
Cookies are not accepted by 40 % of our users and in addition to that
for each domain a different cookie is created what makes it really
complicated.
I guess a combination of Browser type, Operating System, Hostname etc
is really insecure as there are many users using the same stuff.
I think the only secure way to logg this is by the way of using
sessions.

One disadvantage of sessions is that they take very much performance of
the server when there are many users at the same time.
Is there a way to reduce performance of the sessions?
Are there any other possibilities except sessions?
Are there freeware php statistic functions that allow the reuse of
their statistic data in our own implementations?

Thank you very much for your help!

Dennis

.

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