The only requirement is the use of the latest Firefox, or any other Gecko-based browser.
Opera and some others seem compatible but actively supporting IE would be
<a href="http://churchof.poisonedminds.com/d/20060621.html">counter-productive</a>.

Browsers in PDA or smartphones (HTC and iPhone) don't seem to work.
Their "touch" interface conflicts with YGWM and their JavaScript support
is sometimes not advanced enough.