First of all – I must confess that I was not aware of this feature till I noticed it today. At home I have multiple monitors but when I am traveling I have single laptop along with me. It is often that when I am working with SQL Server I have to refer web for information on the subject I am working on.
Recently I pressed CTRL+ALT+R and suddenly a web browser opened in SSMS. I later realize that I can also access the same from SSMS >> View >> Other Windows >> Web Browser.
Now user can open web browser and New Query editor and split them vertically (Go to Windows and click on New Vertical Tab Groups) and have both side by side. Very near feature. I am personally going to use it again and again.
Reference : Pinal Dave (http://blog.SQLAuthority.com)