CellLabelPositioning is an option for cells that specifies where the label for a cell is positioned.
CopyFile["file_1", "file_2"] copies file_1 to file_2.
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.
Install
(Built-in Mathematica Symbol) Install["name"] starts a MathLink-compatible external program and installs Mathematica definitions to call functions in it.
Path
(Built-in Mathematica Symbol) Path is an option for Get and related functions which gives a list of directories to search in attempting to find an external file.
ScreenRectangle is a global option that specifies the position of the screen by giving the coordinates of two diagonally opposite corners.
StartingStepSize is an option to NDSolve and related functions that specifies the initial step size to use in trying to generate results.
UpdateInterval is an option to Refresh and Dynamic that specifies at what time interval to do updates.
ValidationLength is an option to FindSequenceFunction and related functions that specifies the number of elements in the input sequence that should be used to validate a ...
$Inspector is a global variable which gives a function to apply when the inspector is invoked from an interrupt menu.