Any hints on how to let emacs send unbinded F1..F12 keys to programs just like in regular terminal when in 'ansi-term' buffer?
                
                A: 
                
                
              It's not "unbinding" you are looking for but binding those keys to the proper escape sequences. The following will bind [f1]..[f5] to the vt100 escape sequences for those keys for term and ansi-term buffers. I am not sure what the proper sequences are for ansi, so tweak the alist accordingly.
(defun term-send-function-key ()
  (interactive)
  (let* ((char last-input-event)
         (output (cdr (assoc char term-function-key-alist))))
    (term-send-raw-string output)))
(defconst term-function-key-alist '((f1 . "\e[OP")
                                    (f2 . "\e[OQ")
                                    (f3 . "\e[OR")
                                    (f4 . "\e[OS")))
(dolist (spec term-function-key-alist)
  (define-key term-raw-map
    (read-kbd-macro (format "<%s>" (car spec)))
    'term-send-function-key))
                  remvee
                   2010-03-08 08:41:19
                
              Doesn't seems to work. It acts in exactly the same way like without the 'term-send-function-key.
                  wu
                   2010-03-08 09:59:40
                Please try again the (format..) statement in de dolist was clobbered.
                  remvee
                   2010-03-08 11:42:41
                Thanks it's working now.
                  wu
                   2010-03-08 14:38:45