A subsystem script called boot is invoked both from the system init scripts, and from a regular cron job. This inspects LCFG resources to determine which other subsystems should be run at each stage. The start and stop methods for each specified script are called by boot at changes in the runlevel as specified by the appropriate resource. The run method is called at specified intervals, using cron. The resources can therefore determine which subsystems are reconfigured, and when.