9/2     When I double-click the "FOO" part in "FOO_BAR" in an xterm, it selects
        the whole word "FOO_BAR".  However, when I do the same thing in
        Emacs20, it only selects "FOO".  Why?
        \- probably emacs notion of what word boundaries are. where does it
           delete to if you run delete-word or fwd-word. you can change the
           regexp. --psb
           \_ forward-word and kill-word only forwards over and kills "FOO".
              How do I change the regexp?  Thx.