1. A networked computer system comprising: a plurality of computer systems that each includes: a network interface that couples each computer system via a network to a common network resource, the common network resource transmitting messages to other computer systems on the network via IP multicast and receiving messages from other computer systems on the network via IP multicast; a memory; and a job sharing processor residing in the memory, the job sharing processor broadcasting to job sharing processors in the other computer systems via the common network resource when the job sharing processor has a job to be shared, the job sharing processor responding to broadcasts from job sharing processors in the other computer systems to potentially accept a job from one of the other computer systems.