  We give explicit, practical conditions that determine whether or not a
closed, connected subgroup H of G = SU(2,n) has the property that there exists
a compact subset C of G with CHC = G. To do this, we fix a Cartan decomposition
G = K A K of G, and then carry out an approximate calculation of the
intersection of KHK with A, for each closed, connected subgroup H of G. This
generalizes the work of Hee Oh and Dave Witte for G = SO(2,n).
