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ST-2 is a revision of an experimental protocol designed to support applications which require guaranteed network services. ST-2 provides mechanisms for creating streams, treeshaped delivery paths with performance guarantees, for applications which require such guarantees. As part of the MultiG project, the authors implemented ST-2 in the BSD UNIX system. The twin goals of this implementation were to see how easily a novel protocol like ST-2 could be incorporated into the BSD networking model and, more importantly, to thoroughly evaluate the ST-2 protocol. Our conclusions are that the BSD model proved quite general, requiring only modest changes (changes which were largely invisible to the application), but that the ST-2 protocol itself needs some reworking.