1. Preamble

This document is copylefted by Albert M.C. Tam (bertie@scn.org). Permission to use, copy, distribute this document for non-commerical purposes is hereby granted, provided that the author's/editor's name and this notice appear in all copies and/or supporting documents and provided that this document is not modified. This document is distributed in hope that it will be useful, but WITHOUT ANY WARRANTY, either expressed or implied. While every effort has been taken to ensure the accuracy of the information documented herein, the author/editor/maintainer assumes NO RESPONSIBILITY for errors, or for damages resulting for the use of the information documented herein.