The queue named low was configured as follows:

- maximum 4 nodes per job
- maximum 45 hours per job
- jobs will be started from this queue only if nothing waits for execution 
in other queues

The intention was to provide a way to submit a large number of jobs that 
will use any idle time but will not unduly prevent regular use of of the 
machine.

Example: qsub -q low script.pbs