I am becoming somwhat suspicious of the visitor counter on one of my sites (running Mambo) and want to re-code it.
What is the most effective way to count unique visitors at any point in time? If the visitor is browsing the site I don't want to keep counting them, but neither do I want to insist that they accept a cookie.
Can I count unique visitors without use of cookies (maybe using header information or the ilk) and if so, how?
Presumably things like "Webalizer Stats" must do it...
Sorry if this is so simple that it should be obvious... I don't seem to be making any progress on "google"...
Sean