You can be logged into both accounts at the same time, in the same internet browser window.
- First, login to either of your accounts.
- Then click your email address at the top-right of the black bar across the top, which will pull down a menu with a button that says “Add account”.
- Click this button and you will be taken to a page which will allow you to login to your other account as well.
You can login to as many different Google accounts as you wish at the same time, if you happen to have others. After logging into multiple accounts, while you are on any Google page you can click your email address in the black bar and it will show you all of the accounts that you are currently logged into. Simply click on one of the listed accounts to switch over to that one.