Comment 30 for bug 261573

> However, I still don't get which key you (and Ubuntu) mean when you talk
> of the "compose" key. Normal PC keyboards have not "Compose" key (cf.
> http://de.wikipedia.org/wiki/Compose-Taste).

I think Compose Key is a Linux thing, but it's functionally the same as AltGr.

> Please see what PC keyboards as I know them look like on
> http://de.wikipedia.org/wiki/Bild:Cherry_keyboard_105_keys.jpg. (The
> third key right to the space bar has the same function as a right mouse
> click.) A possible layout for a laptop keyboard layout can be seen on
> http://de.wikipedia.org/wiki/Bild:Laptop_Tastatur.jpg.
>
> You always have a button called "AltGr" (see
> http://en.wikipedia.org/wiki/AltGr), whether you use a laptop or a
> standard PC. Since the "strange key" on the MacBook Pro keyboard has
> nothing printed on it apart from a symbol that is cryptic to me (and -
> as I would suppose - most other users), I would recommend putting AltGr
> on that key and putting the "Windows key" functions on both "Apple"
> keys.

Not all keyboards have AltGr labeled as such, actually. I haven't
seen one labeled that that was made in the last 20 years, with the
exception of one laptop. As it turns out, MacBooks don't have an
AltGr at all. Instead, they only have Apple and Return. This is an
interesting problem, which seems to boil down to a hardware
limitation, though there really ought to be some way around it since
it's obviously a problem. Perhaps a .Xmodmap file remapping that
Return key to AltGr could work, but I don't know .Xmodmap syntax to do
it.