Hello all,
I recently bought a Tecknet Gryphon Gaming Keyboard, and it came with an extra set of keys at the very top of the keyboard. You can see these keys at https://images-na.ssl-images-amazon.com/images/I/81xlBmpVP9L._SX466_.jpg They are labeled as M1, M2, M3, M4, M5, M6, M7, M8, M9...