A positive pressure gradient is maintained across an open access port of an interface chamber such as a load lock chamber which provides an interface between a low pressure chamber such as a transfer or buffer chamber, and a high pressure area such as a staging area or factory interface area. A coater imbedded in a coater bed, defines in part the metering slot. The DED searches data packets for content match information. The distributed store may lock the primary state for access by a process executing on one of the application servers. Suitable reactors can comprise an electromagnetic radiation source that projects through the reactor to drive the reaction at an electromagnetic radiation reaction zone.