The Wolfram Language's unified architecture allows every aspect of the Wolfram System's interface to be controlled and specified programmatically using the symbolic constructs and functions of the Wolfram Language.

Options — find option settings for any aspect of a notebook or the Wolfram System interface

SetOptions — set any of over a thousand possible options

$FrontEnd — symbolic object representing the complete Wolfram System front end

$FrontEndSession — symbolic object for the current Wolfram System session

SelectedNotebook  ▪  EvaluationNotebook  ▪  NotebookSelection

Cell & Styling Options »

DefaultNewCellStyle  ▪  StyleDefinitions  ▪  InputAliases  ▪  ...

Window Options »

Magnification  ▪  DockedCells  ▪  Background  ▪  WindowMargins  ▪  ...

CurrentValue — find dynamically updated interface values

EventHandler  ▪  FrontEndEventActions  ▪  NotebookEventActions

FrontEndTokenExecute — execute a menu-like front end command

FrontEndExecute — send an expression to be executed by the front end

FrontEndToken — representation of a front end command which can be given to FrontEndExecute

UsingFrontEnd — execute kernel commands using a front end if necessary

VersionedPreferences — whether to make preferences specific to a particular version

$DefaultFrontEnd — symbolic object for the default Wolfram System configuration