&TCAR; is supported by Subversion, a version control system which allows you to keep old versions of files and directories (usually source code), keep a log of who, when, and why changes occurred, etc., like CVS, RCS or SCCS. When using Subversion there is one source repository and many working copies of that source repository. The working copies are independent one another, can be distributed all around the world and provide a local place for designers, documentors, translators and programmers to perform their work in a descentralized way. The source repository, on the other hand, provides a central place for all independent working copies to interchange data and provides the information required to permit extracting previous versions of files at any time. &intro-repoconvs-policy; &intro-repoconvs-worklines; &intro-repoconvs-relbdirs; &intro-repoconvs-syncpaths; &intro-repoconvs-extending; &intro-repoconvs-filenames; &intro-repoconvs-layout;