Consider this example:

  proc show_invocation {} {
      return [info level -1]
  }


  proc a args {
      puts "Beginning of a."
      puts [show_invocation]
  }


  proc b args {
      a x y z
  }

  proc c args {
      b 1 2 3
  }

  c skip-to-my-lou

It has output 

  Beginning of a.
  a x y z

In English words, this illustrates that a [proc] can report on the command-line
which invoked it.  In particular, this provides a base for introspection on the
'''proc''' call-stack, coded in "[Print proc sequence]", "[A basic debugger]", 
"[List the call stack]", and perhaps elsewhere.



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There's more, though ...


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