“Enter/Return” with, or without “Fn”

Question

Does Mac OS X, and any Mac application, handles Fn+Enter differently from Enter?
As optional question, does any application handles Fn+Return differently from Return?

Answer 1

I guess since fn+return equals enter, the fn+enter-combination would equal fn+fn+return which does not make much sense, so my vote is: no, there is no app that can receive this combo.

To prove, you'll need to read the key codes sent from keyboard to the system when it´s pressed (ie. Full Key Codes could do this for you) - since I don´t have a keyboard with a physical enter I unfortunately can´t do that.

Answer 2

This is not hard to find out.

Open vim and enter insert mode

( Note: I just hit 'j' several times to move the cursor. Why must I live like this? Vim mode! Just did it again.)

Hit control-v

Hit your keystroke combo

Observe the char printed

repeat

check if printed char is different

if yes then they are different

if no , such as <Tab> and <Shift-Tab> on the console, then they are not different.

EDIT: Some background:

CTRL-V

Insert next non-digit literally. For special keys, the terminal code is inserted. It's also possible to enter the decimal, octal or hexadecimal value of a character

i_CTRL-V_digit.

The characters typed right after CTRL-V are not considered for mapping.

{Vi: no decimal byte entry}

Note: When CTRL-V is mapped (e.g., to paste text) you can often use CTRL-Q instead

i_CTRL-Q.

I tried this in my terminal.

ControlVEnter gave me ^M

ControlVFnEnter gave me ^C

So vim sees the two as different. They send different codes.

Answer 3

Does any application handle Fn+Return differently from Return?

Yes! In iTunes 10.5, Return will make a highlighted song start playing but Fn+Return will allow you to rename the song. This was revealed to me at How can I rename a song in iTunes with a keyboard shortcut?