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>From email@example.com Wed Jul 2 13:50:47 1986
>Date: Tue, 1 Jul 86 13:31 EDT
>From: "David A. Moon" <Moon%SCRC-STONY-BROOK.ARPA@u-tokyo.junet>
>Subject: function keys
>To: Masayuki Ida <firstname.lastname@example.org>
>Received: from CSNet-Relay by utokyo-relay; 2 Jul 86 13:32:15-JST (Wed)
>Do function keys modify other characters that are pressed at the same
>time (like SHIFT and META), or do they stand by themselves (like RETURN
>and Q)? If they stand by themselves, then function keys can fit into
>Common Lisp simply as twenty (or however many you have on the particular
>keyboard) additional characters that are not STANDARD-CHAR-P and not
>GRAPHIC-CHAR-P. I don't think the fact that some function keys are
>entered with SHIFT ought to be reflected in CHAR-UPCASE and related
Many personal computers which are also used as a low cost terminal in japan have function keys.
They can be assisted by SHIFT key.
It doubles the capability.
For example, if there are 10 function keys, pressing function 1 at the
same time with shift key acts as a function 11.
Logically, function keys can be viewed as independent keys,
even if they may be assisted by shift key.
So, by now, I think they are the (20 or other numbers of) additional characters that
are not STANDARD-CHAR-P and not GRAPHIC-CHAR-P as you stated.