[9fans] keyboard events in sam

[Lorenzo Bolla]

Hi all,
looking at sam sources from plan9port, it seems that CTRL-0 and CTRL-p (and
followings, like CTRL-1 and CTRL-q, CTRL-2 and CTRL-r, etc) corespond to the
same hex value.
Is there a way to discriminate between them?
I haven't found a way to detect the press of the Alt key (or is it just used
to compose utf chars)?
Or, even better, can you point me to a more detailed document than man that
explain how keyboard is handled?

Thanks,
L.