  Microquasars provide new insights into: 1) the physics of relativistic jets
from black holes, 2) the connection between accretion and ejection, and 3) the
physical mechanisms in the formation of stellar-mass black holes. Furthermore,
the studies of microquasars in our Galaxy can provide in the future new
insights on: 1) a large fraction of the ultraluminous X-ray sources in nearby
galaxies, 2) gamma-ray bursts (GRBs) of long duration in distant galaxies, and
3) the physics in the jets of blazars. If jets in GRBs, microquasars and Active
Galactic Nuclei (AGN) are due to a unique universal magnetohydrodynamic
mechanism, synergy of the research on these three different classes of cosmic
objects will lead to further progress in black hole physics and astrophysics.
