keybindings when using xinerama

[Mike]

Well, I'm confused.
Just put up a second monitor with XFree86 running +xinerama; everything
looks/works ok, except that I can not find a binding to switch from
one screen to the other.  I can drag apps from one screen to the other,
mark + attach them accross, and everything else is dandy - just hate
to reach for the mouse every time i want to switch focus to the
other screen...  What am I doing wrong? :)
Mike