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Excerpt from The Art of Computer Programming by D. E. Knuth:

    "Subroutines are special cases of more general program
     components, called coroutines.  In contrast to the un-
     symmetric relationship between a main routine and a sub-
     routine, there is complete symmetry between coroutines,
     which call on each other."

coro is a C library that implements the low level handling of coroutines.
Despite it's simplicity, there is no portable way to implement them. The goal
of this library is to build a standard API for coroutines and implement it for
as many architectures as possible. Currently on the i386 architecture is
supported.

  -Kelly
   kbyanc@posi.net