Acknowledgments The first version of this guide was written by Rob Savoye. If not for his tireless efforts, this book - and this project - would never have come this far. John Steinhart has also been supportive of the project from the beginning. I have shamelessly plagiarized one of his early announcement emails in the early part of this chapter. Ann Barcomb was instrumental in taking this guide from the 0.3.0 to the 0.4.0 version, incorporating the many changes that came with &app; version 0.8.0. &app; is based on the public domain program GameSWF, a graphics library for games that contains the heart of a SWF interpreter. In December 2005, &app; was forked from GameSWF and repackaged in the GNU project style, and a major recoding started. &app; makes use of jemalloc, which is copyrighted by Jason Evans <>. The terms of the license follow: Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice(s), this list of conditions and the following disclaimer as the first lines of this file unmodified other than the possible addition of one or more copyright notices. 2. Redistributions in binary form must reproduce the above copyright notice(s), this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Finally, thanks to all of the &app; developers I haven't mentioned for all their hard work, and for answering my unending questions.