function keys

[David A. Moon <Moon@STONY-BROOK.SCRC.Symbolics.COM>]

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
functions.