From David Schneider-Joseph:
Popular Power Background is a utility for Mac users which allows you to run the Popular Power distributed computing environment in the background while doing other tasks. It has been tested with versions 0.3.2 and 0.4.0. It may work with other versions, but I give no guarantees. In order for Popular Power Background to work, you must disable animation and set the activation delay to Never in the Popular Power Settings control panel. To run Popular Power in the background, simply launch Popular Power Background.