Small, hand-held device that's moved on a flat surface to control the position of a pointer on screen. A mouse normally has two buttons. In Windows, the left-hand button selects text or starts an application. The right-hand button displays options for the item. If you want to change a file so that it can only be read, and not written to, move the pointer to the file name (in Explorer) and select the file with a single click on the left-hand button. Now click once on the right-hand button to display the properties for this file.
