ScottHope:
That'll be the Chrome browser then. I probably won't be doing any investigating tonight and I have a few things to get done tomorrow, so I'll have a search after that. : )
Just so you know before you waste a bunch of time digging, I use Chrome exclusively and have never been asked to to sign in (after the very first time) and I haven't touched any of my internet settings (cookies or otherwise) from the day I installed it.
Plus if he sets it up as a bookmark (or his homepage) after logging in it shouldn't ask for a login anymore.