Questbridge & teacher recs

I learned that the application goes live in August and that the whole thing is due September, but I got several questions about teacher recommendations.

  1. Is QB recommendation any different from common app? Is it supposed to entail my financial and social struggles, should I notify my teacher, etc.
  2. If I'm not selected as the finalist, can I ask the teacher to reuse that recommendation for common app?
  3. How are they actually submitted? I'm trying to describe the process to my teacher, but I don't know exactly, is it through email, where I can insert their email in the application, they get emailed and can attach their recommendation?

Thank you, please let me know any other teacher rec related details, if you know anything extra.