A Mice designed for Windows have two or three buttons. The center button is programmable and depends on the manufacturer for its functions. The left button is the normal button used for clicking to select an item and clicking and dragging to move or copy. The right mouse button is very useful in Windows. For example, when you right-click a folder in Windows Explorer, you get a menu that allows you delete, rename, cut, copy or perform other operations on the folder.
Programs use the right-click for their own functions.
When in doubt, try a right-click. The disk on which the information is stored. The folder it is in. The name of the file that contains the information. There may be other hard disks with other letters on some systems.