A modular fluid supply system for use with a liquid supply source includes a plurality of container packs, a fluid delivery line in fluid communication with the containers of the packs, and a controller. A first polishing pad is coupled with the first spindle, and the first polishing pad has a first surface extending along a plane generally perpendicular to the central axis of the first spindle. Upon detecting a triggering event pertaining to the target object while executing the application object, the virtual machine stores the state information of the target object in a target state info object in a heap space such that the state information is maintained across instances of the virtual machine.