Gmail is a popular and stable web based email service from Google. Many users create more than one gmail account for different reasons. For example, one Gmail account could be used for personal emailing needs while other for business email correspondence. You can easily open two Gmail email accounts at the same time and track latest email messages.
Open 2 Gmail accounts in same browser simultaneously
1. Open google.com/accounts and login into your Gmail account.
2. Click Edit next to “Multiple sign-in” listing.
3. On next screen, turn on this feature after reading instructions.

You can open different Gmail accounts in seperate browser tabs. Also, you can toggle between email accounts using drop down option at top right of Gmail inbox (after enabling above settings).
this is very cool feature started by Google.
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Nice information, thanks.
Thanks a lot!! That was really usefull !