AntiFreeze is a web-based utility that enables one to easily browse, modify, and inject code objects from a PYD file. It provides the ability to view and edit disassembled Python code directly, as well as edit any properties of a code object. The toolset is comprised of four major components: functionality for extracting code objects, a disassembly engine, a Python assembler, and the interface itself.

http://dvlabs.tippingpoint.com/blog/2008/06/23/hacking-the-pirates-of-the-caribbean-online-mmorpg