Purpose: document tools and techniques for creating persistent
state in Tcl and Tk applications.  By persistent state, I mean
the ability to have a Tcl/Tk application , at start up, initialize
all its variables, widgets, etc. to the value they had at the
time of last termination.


This will require the storing of variables in a form they can be
reset, recognizing all widgets, their configs and values, etc.

   * plain variables
   * arrays
   * handles (what to do about open file handles, etc.?)
   * procs (defined, renamed, etc.)
   * interps
   * threads
   * widgets

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[Metakit] is one tool.

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Relational databases (postgresql, for example) do a good job of keeping track of state.  They have been perfected for just such a task...