The Apple Macintosh also uses the Control, Option and Command keys, found at the bottom of the keyboard to enter special keystroke sequences, just like with the Control and Alt keys on DOS, Windows and Unix systems. The Mac Command key, by the way, is the key with the little apple and clover-like symbol. The Tab and arrow keys are used alone or in conjunction with other keys to move the cursor or to go to other screens. The Shift and Caps Lock keys are used to type in upper case letters. The Page Up and Page Down keys are generally used to advance to the previous or next screen, respectively.
Icons generally represent objects like files, folders, or application programs.
The mouse used with DOS and Windows has two buttons, though mostly, only the left button is used, unless stated otherwise. Unix X Windows systems use a mouse with three buttons, though again, mostly the left button is used. In any case, to move the mouse cursor, keep the mouse on the desk or mouse pad and move it without lifting it. If you run out of desktop real estate, lift the mouse, reposition it and move it again. Double-clicking, that is, quickly clicking the mouse button twice when the cursor is on top of an object, generally opens the folder or file, or launches the program that was selected.