Microquasars: Open Questions and Future Perspectives
  The discovery and subsequent study of microquasars lead to major progress in our understanding of: 1) the nature of relativistic jets seen elsewhere in the universe, and 2) the connection between the accretion onto compact objects and the formation of collimated jets. A detailed account of the major progress accomplished until present was published in Annual Review of Astronomy & Astrophysics (Mirabel & Rodr\'\i guez, 1999). Here I review the questions that remain unanswered, as well as the future perspectives that this new field of research is opening. 
I.F. Mirabel