How to start using GAE with Hello World example on windows XP

My Example of the application please look here
Now, let's get started...

1. Register in http://appengine.google.com/ (follow the step, including activation)
2. Download and run python 2.5.4 from http://www.python.org/download/releases/2.5.4/
3. Download and run google SDK from http://code.google.com/appengine/downloads.html
4. Create a new folder named helloworld in Google App Engine
5. Create a helloworld.py file, with the code:
   

   print 'Content-Type: text/plain'
   print ''
   print 'hello, world'

   
   
6. Create a app.yaml file with the code:
   
   

   application: helloworld
   version: 1
   runtime: python
   api_version: 1
   
   handlers:
   - url: /.*
   script: helloworld.py

   
   
7. Open command prompt, go to google_appengine/dev_appserver.py helloworld/
   
8. Run http://localhost:8080/ on the web browser
9. To close the command prompt, press Ctrl-c or just close it
10. Go to http://appengine.google.com/ again, and click on create an application button (Remember your application identifier name)
11. Edit the app.yaml file, and change the value of application: to your application identifier name (originally helloworld)
12. To upload, run the command google_appengine/appcfg.py update helloworld/ in command prompt
13. To check, go to http://application identifier name.appspot.com
14. To learn more. go to http://code.google.com/appengine/docs/python/gettingstarted/helloworld.html