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?
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.
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 your keystroke combo
Observe the char printed
check if printed char is different
if yes then they are different
if no , such as
EDIT: Some background:
I tried this in my terminal.
ControlVEnter gave me
ControlVFnEnter gave me
So vim sees the two as different. They send different codes.
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?