anyway to find the key just hit in a keymap command ?

[abel elenas]

I am trying to make a keymap 4 a mode in emacs.
the commands run by many key is the same but it needs to know the key 
just hit...

(define-key sel-key-map "e" 'sel-insert)

(defun sel-insert (&optional nbr)
        (interactive "p")
        (put-char-just-hit-in-table char)
        (self-insert-command (or nbr 1)))

But i don't know the way to get the char that have just been hit ...
Any way to do that ? (Self-insert-command seems to find it easy but i 
don't know how...

thanks