What is XGrid?
XGrid is a program developed by Apple that allows very easy setup of a cluster of computers, or agents (that would be you). A client computer (that would be me) can ask the cluster to perform some tedious tasks when the agent computers are idle and would otherwise waste their CPU. Many tasks can then be performed in parallel by all the computers in the cluster and the results will be obtained much faster than if the jobs were run in only one machine.