[APN] 20130628 - finally figured the way to understand coroutine based programming was (as always) to sit and actually write some real code. The result is the `fiber` package. From its introduction:

    :   This package provides an implementation of "fibers" for Tcl.  Fibers, as the term is used in this package, are threads of execution that are co-operatively multitasked and use message passing as their primary means of communication, including channel based I/O.

    :   Fibers are implemented using Tcl coroutines and are compatible with any Tcl application model provided it runs the Tcl event loop.
            
    :   Erlang programmers may find some similarity to that language's process model. That is not just happenstance.

Documentation is at [http://tclfiber.sf.net]. The project page is at [http://sourceforge.net/projects/tclfiber]

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