On the pages of the Google Operating System blog , information appeared about launching multiple accounts - a functional that allows the user to be logged in to multiple accounts at once and switch between them on the fly.
Not all Google services have the ability to use this feature. At the moment, instant switching is possible for Gmail, Google Calendar, Google Sites, Google Reader, Google Voice, App Engine and Google Code. But we must assume that the list will expand.
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When multiple accounts are enabled, next to your login in the upper right corner you will see a drop-down list of all related accounts and you can switch between them in two clicks.