DisplayPacket[] is a MathLink packet that indicates the beginning of a series of expressions related to a PostScript graphic.
DragAndDrop is a global front end option that specifies whether to allow drag-and-drop editing.
EndDialogPacket[integer] is a MathLink packet indicating the end of the Dialog subsession referenced by integer.
Environment["var"] gives the value of an operating system environment variable.
Exit
(Built-in Mathematica Symbol) Exit[] terminates a Mathematica kernel session.
ExponentPosition is an option for RadicalBox that specifies the placement of the index outside a radical sign.
FileNameDialogSettings -> {opt -> val} is a global option that specifies settings for the Insert File Path dialog box.
FontTracking is an option for Style and Cell that specifies how condensed or expanded you want the font in which text is rendered to be.
FractionLine is an option for fractions that specifies the thickness of the line separating the numerator and denominator.
Full
(Built-in Mathematica Symbol) Full is a setting used for certain options, typically indicating that a full range of values should be included.