Comment 14 for bug 251709

The raw keyboard patch is really broken, it modifies #define's so there is no clean way to have -y without breaking the regular behavior.

Besides, there is a large thread on the rdesktop mailing list:
http://sourceforge.net/mailarchive/forum.php?thread_name=a905f5230904142325g2e4d575bp35412af4a77fd4eb%40mail.gmail.com&forum_name=rdesktop-devel

I quote Peter Åstrand here:
"For a normal application, looking at the "keycode" is simply a big no-no.
Using the "keysyms" is the preferred approach; works on all platforms."