# Class type Shell_uq.system_handler_engine_type

    class type ['a] system_handler_engine_type = object .. end

This engine type can be passed as `system_handler` to `Shell_sys.register_job` in order to watch a running job.
Inherits

- `Uq_engines.engine`

    method system_handler : Shell_sys.system_handler

Returns the `system_handler`. The `sys_wait` function simply calls `Unixqueue.run` to allow integration into event systems.