[xubuntu-users] Xfce vs Xubuntu sessions

[George F. Nemeyer]

Looking for some answers regarding types of sessions and starting them:

1.  What, exactly, is the difference between an Xfce session and
    an Xubuntu session?  What is launched when starting an Xubuntu session
    that isn't started with an Xfce session? (They look similar at first,
    but when starting a Xfce sessions, some desktop items are missing,
    and lots of launcher commands/notification items do not work properly,
    or at all.  I *suspect* this is somehow dbus or other interprocess
    communication stuff that's not being done.  Insight appreciated.)

2.  What command(s) need to be run by an X display manager to start
    an Xubuntu session?
      (Example for XDM, specifying:
                exec startxfce4 --with-ck-launch
       in a user's .Xsession file will start an xfce4 session.
       What exec arguments would be needed to start an Xubuntu session?)

3.  For lightdm, docs say it offers different kinds of sessions depending
    on what is installed (i.e. gnome, xfce, kde, etc.).  Where is it
    looking to determine what is installed?

4.  For lightdm, where exactly are the actual session startup commands
    that gets executed specified?  (Note: Not the session *name* but the
    actual path/command to the command/script that is run.  All the docs
    I have found tell you where to put the *session name* in the config
    file, but not where the actual session's startup commands are
    located.)

Thanks for any help available.

=^_^=  Tigerwolf