I wrote a blog post about it: <a href="http:&#x2F;&#x2F;250bpm.com&#x2F;blog:56" rel="nofollow">http:&#x2F;&#x2F;250bpm.com&#x2F;blog:56</a>
Also, a blog post about how coroutine spawning is done: <a href="http:&#x2F;&#x2F;250bpm.com&#x2F;blog:48" rel="nofollow">http:&#x2F;&#x2F;250bpm.com&#x2F;blog:48</a>