Its essential in many cases to sign in to more than one gmail account when we are using multiple services at different emai addresses, by default Google doesnt permits this, even we can enable it Separately
to do this follow the steps:
google Warns these steps before enabling multipple sign ins
On – Use multiple Google Accounts in the same web browser.
Select each of the checkboxes below to confirm you understand how to use multiple sign-in:
The account you’re currently using is displayed at the top of most Google product pages, or at the bottom of most pages on mobile devices. Always check to make sure you’re using the account you want.
Not all Google products support multiple sign-in. When switching between Google products, the account you’re currently using may change.
Google products not listed above will default to the first account that you signed in to using your current web browser session.
Offline Mail and Offline Calendar will be disabled. You may lose any unsent mail. Learn more
Once accepted you will be able to switch accounts like this
A second option is there to Switch between these account, change the address bar slightly
after /mail/u/ 1 indicates account 1 , 2 = account 2
so we easily bookmark these like mail1 and mail 2 on the bookmarkbar(chrome) and so can switch much faster
currently only these products supports multtiple logins