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This command clears the mainwin of text and sets the cursor back at the upper left hand corner.  It is useful  for providing a visual break to separate different functional sections of a program.  Additionally, since the main window doesn't actually discard past information on its own, the CLS command can be used to reclaim memory from a program by forcing the main window to dump old text.
  print "The total is: "; grandTotal
  input "Press 'Return' to continue."; r$
  print "*** Enter Next Round of Figures ***"

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