I own a Logitech G11 gaming keyboard, and i was wondering how the MR button works????? please help?

i know how to put in shortcuts and stuff but there is the button MR and i dono what or how it works, could you help me with that. Or how it works within a game

You need to use the software for it. The disk comes with it, but it is called Logitech G Series Keyboard Profiler.