1. A data processing network having a first processor, a second processor and a communication system linking said first processor and said second processor, wherein control logic associated with said first processor and said second processor manages information flow between said first processor and said second processor, said control logic comprising: means for responding to calls issued by, or on behalf of, one or more application programs running on said first processor; and means responsive to the issued calls for determining which of a set of files is currently required by the one or more application programs and maintained by said first processor by classifying files in the set of files as either static files required each time the calling applications are run or dynamic files required only when particular issued calls are made, and if the currently required file is the most up-to-date version maintained at said second processor and, if not, replacing and/or augmenting the currently required file at said first processor with a selected file downloaded from said second processor.