Once you've built an application that behaves the way you want, the next step is to think about how you're going to deploy it. How will you start and stop the process? Under which user account should it run? How will you keep track of what's going on? Twisted provides a number of tools that you can use to manage how your application behaves in these areas. You can run your application in a background process, and limit its permissions by having it run as a specific user. You can run multiple services in the same process. And you can use logging to record errors and track your program's usage.
Building Simple Clients and Servers
Web Services and RPC
NNTP Clients and Servers
Services, Processes, and Logging