You can reschedule cron tasks and change parameter values
without stopping and restarting the server. You can create cron tasks
and cron task instances, remove cron tasks or cron task instances,
and change cron task parameters.
Preexisting cron tasks
There are preexisting cron tasks set up to run scheduled
jobs on the system server. Cron tasks are behind-the-scene jobs that
run automatically and on a fixed schedule.
Access levels for cron tasks
Access levels determine what users can do when they are
using the Cron Task Setup application.
Cron task parameters
The cron task class file lists parameters. Parameter tables
store parameter values for cron task instances.
Instances of cron tasks
An instance is a copy of a cron task that you can change
to meet your business needs. You can create multiple instances for
each cron task.