  We demonstrate experimentally and numerically the existence spatial solitons
in multiple-quantum-well semiconductor microresonators driven by an external
coherent optical field. We discuss stability of the semiconductor-resonator
solitons over a wide spectral range around the band edge. We demonstrate the
manipulation of such solitons: switching solitons on and off by coherent as
well as incoherent light; reducing the light power necessary to sustain and
switch a soliton, by optical pumping.
