You're talking about Google's multi-login, which allows you to log into Google with multiple accounts. This thread, however, is about Chrome's profiles, which lets you open multiple browser windows each with a different profile (i.e. cookies, Google account, extensions, etc.).
>You can actually sign in to multiple google accounts and switch between them (at least for email / docs - not analytics / other services). I can't remember exactly how to do it, I think you need to enable multiple sign in on the account first.
