[Twisted-Python] AFactory

[Zooko]

> Well, it'd also be nice to see coverage of when to implement a Service, 
> what's involved in doing so, and all that .. maybe a higher level 
> document about "Writing your application with Twisted" would be more 
> appropriate for that though.

Yes, I have heard of Services, but there is apparently no doc, and I am
ignoring the concept of services until I am forced to deal with it.

I think a "Writing your application with Twisted" doc would be perfect.

Regards,

Zooko