First of all there's session manager lxqt-session. The binary is launched right at the beginning of LXQt sessions and in turn responsible for launching and monitoring all other components constituting the sessions.
GUI "LXQt Session Settings" (binary lxqt-config-session) is used to configure various settings affecting the session, e. g. which window manager to use or which applications to start automatically.
Binary lxqt-leave deals with interrupting or terminating sessions. It comes with several options expressing the action they trigger, e. g. --leave, --hibernate, --shutdown or --reboot.
