  If the jets of microquasars carry a significant power in the form of
relativistic hadrons, then gamma rays and neutrinos can be produced by
interactions with matter and photon fields either external or internal to the
jet. In this paper I present some recent results of calculations of the
interaction of hadronic jets with 1) matter of the jet itself, 2) photon fields
generated by synchrotron radiation of both protons and electrons, and 3) matter
external to the jet (e.g. a clumped wind). I briefly discuss neutrino
production in these scenarios and the prospects of detection with new gamma-ray
instruments. Finally, I make a few comments on the controversy about the nature
of LS I +61 303.
