Saving and replaying plots

There are some potential difficulties in loading a previously
saved display list.  I'll have a bit of a look.

I don't know if this can help. But, I was thinking about the possibility
  to recall previously done plot during the same session not
                                            ~~~~
  between sessions.					    
  Typical usages that I have in mind: 
  1) do a plot, do some others to explore how something can be represented, 
     going back to the first  (or some other before), decide to add
     something to the third, final choice for it, add to it final
     details (e.g. legend, change color,...), print it.
  2) teaching: students work in a labs for sometimes, 
     I can review what they have done 
     (Ok, there are other solutions,i.e, they save plots in a postscript
     file and I review the file, but it would be very nice to do this
     from inside R without re-issuing all the commands again).
  3) .....................
  
  g.
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