Due to a bug in the current build of Visual Studio 2015 C++ comments starting with three forward slashes are highlighted in a different colour to all other comments.
The colour difference is most visible when using the Dark colour theme but is present in the Light and Blue colour themes as well and has been observed in both the Community Edition and Professional Edition.
If you close all open instances of Visual Studio 2012 add the following undocumented registry key to your registry:
Windows Registry Editor Version 5.00
When you next start Visual Studio you can find the command ID for menu items by holding Ctrl+Shift and hovering over the menu item. After hovering you are presented with a modal dialog containing debug information as seen in the image to the right. This information can, for example, be useful in .vsct files when extending Visual Studio functionality.
This will work for most menu items although Ctrl+Shift hovering over dynamic menu items like those found on DEBUG menu will for some reason not pop up the dialog.
This information is shamelessly stolen from this MSDN blog post which also contains more in depth information about the topic.