Does anyone know of documentation for PCI programming that details the modifiers for a given command?

ie a list of the commands from "%InitCommand=cmd0=36,108", what is "36,108" and what modifiers apply to this command? I am trying to develop some new PCI programs and I can export and modify the machine blocks but I don't know what else I can control in a drill cycle, mill cycle, etc..

Thanks,
ElevatorMan