We develop and host a bunch of extranets, which without login consist of your typical authentication page. We put a robots.txt file there, and the only sites th

We develop and host a bunch of extranets, which without login consist of your typical authentication page. We put a robots.txt file there, and the only sites that link there are our customers companies home sites. Google still indexes them. The definition of "relevant" here defies my wildest imagination.