Gmail account offers you hundreds of features including login of different user from same window. But, firstly enable multiple sign in option available under Gmail account. On the top most corner of the right side you can see your Gmail Id, click on your email address. After clicking it, you will get a drop down menu that displays the option add account. After clicking on it, you can enter your other account without logging out from previous one. However, due to cookie value you can use one account at a time. But, different users can use Gmail account for multiple login with same browser. Isn’t it great?