it wasn&#39;t easy to find, but i finally found something that states directly that Twisted <br><a href="http://www.dalkescientific.com/writings/diary/archive/2006/08/28/levels_of_abstraction.html">http://www.dalkescientific.com/writings/diary/archive/2006/08/28/levels_of_abstraction.html</a><br>