-PS activates the client Print Server mode. When a client is in print server mode, it monitors all network print queues assigned in the workstation options for rendering jobs (printing and archiving).
Once the print server detects a new rendering job, it marks the job as In Progress in order to avoid another print server, serving the same network print queue, from rendering the same job. This implies that a print server can serve many network print queues and a network print queue can be served by many print servers