From the KnowledgeBase
I now have two (three... four...) Google accounts. One is Princeton Gmail and the others are personal email addresses. What are my options?
At any point you can see which account you are signed in as (and whether you can add or switch to a different account), by clicking on your email in the upper right corner of the screen.
- Forward all your email from secondary email addresses to the one primary Google address that you prefer. Using your Princeton Gmail account offers more space than a personal Gmail account, and also allows you the use of the Princeton address book when composing email messages; and it is advertising free. Google's help pages have instructions on how to use different sending addresses within the same account.
- Use different browsers for each of your accounts (Google Chrome, Firefox, and Safari for example).
- Use Google Chrome's incognito window or the incognito/private browsing modes on your browser of choice to sign in to your second account. Note: your history and login information won't be saved while using this option.
- Google help offers additional tips on multiple sign-in options.