update_plex_state
update_plex_state(plexno); /* set the state */
void update_plex_state(int plexno);
update_plex_state(sd->plexno); /* update its state */
update_plex_state(sd->plexno); /* update plex state */
update_plex_state(plex->plexno); /* it'll come up if it can */
update_plex_state(sd->plexno); /* update its state */