In previous work we presented a foundational calculus for spatially
distributed computing based on intuitionistic modal logic. Through the
modalities $\Box$ and $\Dia$ we were able to capture two key
invariants: the mobility of portable code and the locality of fixed
resources.

This work investigates issues in distributed control flow through a
similar propositions-as-types interpretation of \emph{classical} modal
logic. The resulting programming language is enhanced with the notion
of a network-wide continuation, through which we can give
computational interpretation of classical theorems (such as $\Box A
\equiv \lnot \Dia \lnot A$). Such continuations are also useful
primitives for building higher-level constructs of distributed
computing. The resulting system is elegant, logically faithful,
and computationally reasonable.