This document was written (with financial support from Sarai/CSDS) over 2004-2005. Most of this document hasn't been updated since then, the only major change has been a license change from GFDL to CC-BY-SA (since the latter makes it more easily reusable). There may be outdated information in this document - make sure that you consult the latest standards, user-guides, etc. before relying on information provided here.