Google Labs developed a multiple Gmail accounts sign-in feature which is now supporting in any internet browser. Obviously this will be very helpful to an advanced user who will have many more than one Gmail account which is connected to various Google Services. While you using this service make sure you use the account which is connected to your Google Service should be used as the primary account. Because the secondary account will not let you login to the Google Services such as Blogger and Picasa Web Albums, but services such as Code, Calender, Gmail, Reader, Sites, Voice, Docs (Docs service is coming soon) will let you work for both the accounts when you use multiple logins.
To enable this feature login to your Google Account page http://google.com/accounts and enable the Multiple Sign-in feature as below.
Click On the Edit to Enable the Feature
Check All the Boxes and Save Settings to Proceed
After the settings are saved, open the browser and log in to your desired primary account. Now could login to your secondary account using the “Sign in to Another Account” feature in Gmail.
Multiple Sign-in Feature
Sign-In options after Login to the Secondary Account
This Options can be used to switch between Email accounts and adding more Gmail Accounts.
The Multiple Accounts Sign-in option currently cannot be used with the Google Apps, since the Google Apps account was still working when your regular account is logged in.
