Science Tools' Distributed Processing System consists of a database-centric arcitecture, and programs called Processing Daemons These daemons, either the DemandEngine or EagerEngine, run on various client nodes participating in the environment and look to the database for work, dispatching processing when appropriate This strategy is backwards in perspective to those of other distributed processing strategies in that the clients are the ones looking for work, rather than having a central node trying to dispatch to them
Descent Propulsion System The rocket engine in the lower part of the lunar module It provides the thrust for the lunar module to leave orbit and descend to the lunar surface, and to control the descent for a soft touchdown