Check this blog entry which explores the resources and best practices available to build companion WP8 apps for Windows 8 (or vice verse).
The article explores:
- the value proposition for building companion apps,
- pointers to specific resources depending on what type of developer you are, and finally
- approaches to code reuse.
- Free Trial Azure
- Download Visual Studio Express 2012
- Download Developer Center VS 2012/Win8
- Signup 30-To-Launch Win8
- Download Windows Phone SDK
- Signup 30-To-Launch Phone