Kavi Mahesh now is at the New Mexico State University (mahesh@crl.nmsu.edu) and Justin Peterson is with CitiBank. This work was done when all four authors were at Georgia Tech, where it was supported by Northern Telecom (research gift), the National Science Foundation (research grant IRI-92-10925), and the Office of Naval Research (research contract N00014-92-J-1234). Jeff Pittges contributed to the programming of an earlier version of the KA system described here.