I can use xev to see what key I just pressed. Also the Emacs
C-h k runs the command describe-key
which is an interactive compiled Lisp function in `help’.
It is bound to C-h k, <f1> k, <help> k, <menu-bar> <help-menu> <describe> <describe-key>, <menu-bar> <help-menu> <describe> <describe-key-1>.
(describe-key key &optional untranslated up-event)
which is an interactive compiled Lisp function in `help’.
It is bound to C-h k, <f1> k, <help> k, <menu-bar> <help-menu> <describe> <describe-key>, <menu-bar> <help-menu> <describe> <describe-key-1>.
(describe-key key &optional untranslated up-event)
Display documentation of the function invoked by key.
key should be a key sequence–when calling from a program,
pass a string or a vector.
If non-nil untranslated is a vector of the untranslated events.
It can also be a number in which case the untranslated events from
the last key hit are used.
[back]
Is useful too.
After a quick check, I now have “S” key (win key) and menu key. And looks they works in both fvwm and Emacs. Good I can have some more keys 
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You could use <code type="name"> to get your code colorized