Those files accessed by tools during a build process are invisibly tracked in such a way that the information can then be used to drive an incremental build of just enough files to bring the build fully up to date. The tracking information includes the association between distinct tool processes. Each...http://www.google.es/patents/US7721272?utm_source=gb-gplus-sharePatente US7721272 - Tracking file access patterns during a software build
Tracking file access patterns during a software build