Running lxsession my appearance settings changed to something that looked like the LXDE session (while my normal session is Lubuntu).
Running lxsession-edit opens the Desktop Sessions Settings that allows to decide which programs should start automatically at login.
Running lxsession-logout opens the options to logout, shut down and so on.
In /home/username/.config/lxsession there are 2 directories (Lubuntu and LXDE) containing a file called desktop.conf.
Can I save sessions in Lxsession, and does it have other options beside what its main definition states ("LXSession is the standard session manager used by LXDE. LXSession automatically starts a set of applications and sets up a working desktop environment")?