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The enter key is typically located on the lower right of the numeric keypad, and the return/enter key on the right edge of the main alphanumeric portion of the keyboard, between backspace and the right-hand shift (and/or control) key (as well as below the backslash key on keyboards using a standard ANSI / US-International layout).
The three differ somewhat in the placement of function keys, the Control key, the Return key, and the Shift keys. In addition to these keys, PC keyboards usually contain the following keys: Page Up, Page Down, Home, End, Insert, Pause, Num Lock, Scroll Lock, Break, Caps Lock, Print Screen.