  We derive inclusive and diffractive forward-gluon production in the
scattering of a $q\bar{q}$ dipole off an arbitrary target in the high-energy
eikonal approximation, suitable to study the saturation regime. We show how the
inclusive cross-section is related to the total cross-section for the
scattering of a colorless pair of gluons on the target: the gluon-production
cross-section can be expressed as a convolution between this $gg$ dipole total
cross-section and a dipole distribution. We then consider as an application the
forward-jet production from an incident hadron and describe forward-jet
production at HERA and Mueller-Navelet jets at Tevatron or LHC. We show how
these measurements are related to the $q\bar{q}-gg$ or $gg-gg$ dipole-dipole
cross-sections and why they are therefore well-suited for studying high-energy
scattering in QCD.
