Identifying the desktop session

[Jim Campbell]

For user help purposes, we're wondering what would be the best way of
identifying the user's user session. For example, under Unity, running:

echo $DESKTOP_SESSION

just produces the result, "gnome."  running lsb_release -a  just gives info
about the general Ubuntu platform.

What would be the best way of identifying what session a user is running?
For starters, we'd need to know Xfce, Unity, Unity-2d, Gnome-Shell, etc.

Jim
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