User281315223 posted
You might want to consider checking out
this listing of all of the Visual Studio 2013 short-cuts, as they likely have changed and expanded significantly since Visual Studio 2003. One of the major changes was the introduction of more specific contextual short-cuts, meaning that F12 might do something
in one section and do something else in another (which could be what you are experiencing).
Can you elaborate on exactly what type of file that you are in and where you want to go / what you want to see from there?