Chartered Manager refers to a professional certification in management: C.Mgr., offered by the CIM Chartered Managers Canada; CMgr, offered by the Chartered Management Institute, U.K.
The DPI control is a physical switch on the top, bottom or side of your mouse. Press or slide the switch to adjust your mouse's sensitivity. Your mouse's LCD then displays the DPI setting, or you see a message on the monitor informing you of the DPI change.
It allows one to look around in one's virtual world, browse menus, etc. For example, many flight simulators use it to switch the player's views, while other games sometimes use it as a substitute for the D-pad. Computer gamepads with both an analogue stick and a D-pad usually assign POV switch scancodes to the latter. The term hat switch is a shortening of the term Coolie hat switch, named for the similar-looking headgear.