 It provides network administrators a method of creating a computing cluster , which allows them to exploit previously unused computational power for calculations that can be divided easily into smaller operations , such as Mandelbrot maps . The setup of an Xgrid cluster can be achieved at next to no cost , as Xgrid client is pre @-@ installed on all computers running Mac OS X 10 @.@ 4 to Mac OS X 10 @.@ 7 . The Xgrid client was not included in Mac OS X 10 @.@ 8 . The Xgrid controller , the job scheduler of the Xgrid operation , is also included within Mac OS X Server and as a free download from Apple . Apple has kept the command @-@ line job control mechanism minimalist while providing an API to develop more sophisticated tools built around it . 
