Login with different user – SharePoint Designer 2010

Have you ever been in to a situation where you want to test something with the help of login with different user’s credentials? Well, we are talking about login in the SharePoint Designer.
If you have used designer then you must know that there is no way to log in with the different user straight. You need to close designer and re open if you wish to test something with different user’s credentials.
In SharePoint Designer 2010, we have an option to do that. However not many people know this. This is because the icon which allows us to do this almost goes unnoticed.

When you click on that small user icon on down left side, it allows you to login with different user without closing SharePoint Designer.