Quantum mechanics permits nonlocality - both nonlocal correlations and
nonlocal equations of motion - while respecting relativistic causality. Is
quantum mechanics the unique theory that reconciles nonlocality and causality?
We consider two models, going beyond quantum mechanics, of nonlocality:
"superquantum" correlations, and nonlocal "jamming" of correlations. These
models are consistent with some definitions of nonlocality and causality.Comment: 9 pages, RevTeX; for the proceedings of the symposium on Causality
and Locality in Modern Physics and Astronomy: Open Questions and Possible
Solutions (York University, Toronto, August 25-29, 1997). This version
contains an additional affiliation and address for one autho
