As described in some other Q/As like this and this, IntelliTrace is a Visual Studio Ultimate feature only. But for some reason I have Visual Studio Professional 2013 (Version 12.0.30723.00 Update 3) and I have IntelliTrace on it. I don't know how it got there but it shows up in Quick Launch (Ctrl+Q) and is enabled from View -> Toolbars -> IntelliTrace. I told my colleague to use it and he didn't have it on his VS Pro! Do you have any clues why IntelliTrace is available on my VS 2013 Pro installation? I see comments from other people, such as @doglin here that he has the same.
I remember I had VS Ultimate trial installed before I installed VS Pro but can it be from there?