What does the 'composer project' mean?

there is a description in the changelog like this:

We’ve added Composer Projects (beta), which allows you to share instructions among several composers.

And I don’t know what it is, and how to use it? Can anyone show me an example?

another question.
I don’t know the difference between:

  • one composer, Continuous instructions
  • multi composer, one instruction in every composer.
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