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A JobScheduler instance is installed, which then receives its configuration from a JobScheduler supervisor.
The configurations of all the remotely configured JobSchedulers in a network are centrally administered by a so-called Supervisor and which distributes the configurations to the remotely configured "workload" JobSchedulers.
If the Supervisor is temporarily not available, the Workload JobSchedulers will continue to work using their local configurations.
See also: [How does a supervisor scheduler distribute the 'Supervisor JobScheduler deploy the central configuration directory'?
SSH execution
It is not always necessary to install a JobScheduler instance on a client to execute jobs remotely.
The JobScheduler can start Jobs (scripts) per SSH.
See also: What is the difference between SSH-Job execution and remote JS-Agents? and category__SSH.