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.
Optical Mouse and Laser Mouse are two different types of mouse that are used in computer. The original mouse was powered by a heavy rubber ball, which would connect to a small wheel inside the mouse. The user would move the mouse on the ball and the trackball would reflect the movement on the screen.