The process goes:
xfsm-manager state -> XFSM_MANAGER_SHUTDOWN
xfsm-client state -> XFSM_CLIENT_SAVING
xfsm-client emits QueryEndSession
user program responds with EndSessionResponse
xfsm-client state -> XFSM_CLIENT_SAVEDONE
xfsm-manager state -> XFSM_MANAGER_SHUTDOWNPHASE2
xfsm-client emits EndSession
user program responds with EndSessionResponse
xfsm-client state -> XFSM_CLIENT_DISCONNECTED
xfsm-client emits Stop
user program quits or after 15 seconds xfsm-client sends SIGKILL.