Hamachi is a community-developed utility for verifying browser integrity, written by H D Moore and Aviv Raff. Hamachi will look for common DHTML implementation flaws by specifying common "bad" values for method arguments and property values. This utility may cause the browser to "freeze" for a long period of time, this is OK, and interrupting the process will prevent all the tests from completing. Some browsers will raise a warning if a script is taking too long to execute - you will need to click "No, do not abort" or the equivalent to allow all tests to complete.