As of Softimage 7.5, you get unlimited batch processing. Before, you got 8 Processing tokens with Advanced and 4 with Essentials.
Batch processing is where you run “xsibatch -processing -script”. Batch processing can includes things like exporting .mi2 files, exporting rib files, baking, committing, asset management, custom render management/submission, dynamics, … anything in a complex pipeline that requires automation and remote processing, but not rendering. (Ref: http://forums.cgsociety.org/showpost.php?p=4870718&postcount=10)