Mathematica's symbolic architecture immediately defines a serializable representation for any Mathematica data or program—which can then readily be stored in a file.

"CopySpecial" is a front end token that converts the selection to a specified format and copies it to the clipboard.

Automatic Numbering creates an automatic numbering object, or counter, in the current notebook.

Copy Graphics Selection copies the selected (or clicked upon) object within the graphic to the clipboard.

DisplayFunction is an option for graphics and sound functions that specifies a function to apply to graphics and sound objects before returning them.

FileNameDialogSettings -> {opt -> val} is a global option that specifies settings for the Insert File Path dialog box.

GridDefaultElement is an option for the low-level function GridBox that specifies what to insert when a new element is created interactively in a GridBox.

Initialization is an option for Dynamic, DynamicModule, Manipulate, and related constructs that specifies an expression to be evaluated when the construct is first used or ...

PageBreakWithin is an option for Cell which specifies whether a page break should be allowed within the cell if the notebook that contains the cell is printed.

NotebookConvert["name"] converts a Mathematica notebook from a previous version of Mathematica to one for the current version.