Sign in many gmail accounts (multi accounts) on a same browser

I sometimes check many Gmail accounts at the same time. I have to sign in and sign out those accounts at first. That is extremely inconvenient. And then a my friend had introduced to a service of Gmail and I have solved this problem. I have pleasure in introducing to you this service.

- First, you go to https://www.google.com/accounts/manageaccount and sign in with any accounts that you have.

- Then you choose Personal Setting --> Multiple sign-in --> Edit (address is "https://www.google.com/accounts/MultipleSessions")

- You choose "On - Use multiple Google Accounts in the same web browser" and check 4 box below.

- Save.

- Click "Back" button as follows:

And now you have two ways to switch accounts together:

- You can click the following arrow:

- Or you can see the address is "https://www.google.com/accounts/b/0/ManageAccount", replace number "0" by number "1", "2", "3",...

Good luck :)