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Emacs uses keybindings with "LFD", the Emacs FAQ provides the following information:

LFD: Linefeed or Newline; same as `C-j'

Is there a Linefeed button on my keyboard (other than C-j)?

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Don't think so. In your keyboard, probably, you have only the "return", "enter" key. There's no linefeed in regular IBM-PC keyboard.

In windows you can use the Shift + Enter to mean a linefeed:

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I figured out that Shift + Enter replaces C-x LFD for the emacs keybinding in question. – David LeBauer Aug 25 '11 at 20:19

Apparently some keyboards do have an LFD key, because the BASH docs also mention this:

If your keyboard lacks a LFD key, typing C-j will produce the desired character.

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commodore 128 seens to be the only keyboard with a linefeed key – woliveirajr Aug 25 '11 at 20:24

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