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  • CellOpen is an option for Cell which specifies whether the contents of a cell should be explicitly displayed.
  • With CellOpen->False, a small cell bracket is still shown to indicate the presence of a cell.
  • Cells which are not open can still be evaluated automatically if you set CellAutoEvaluate->True.
  • See the Mathematica book: Section 2.10.9.
  • See also: Visible, CellGroupData, ConversionRules.