DocumentationMathematicaBuilt-in FunctionsNew in Version 3.xNotebooks
Deletable is an option for Cell which specifies whether the cell can be deleted interactively using the front end.
With the setting Deletable->False at the notebook level, you can prevent any cells in any notebook from being deleted.
See Section 2.9.10 and Section 2.11.9.
See also: Editable, Selectable.
New in Version 3.