WindowFrame is a notebook option that specifies the type of frame to draw around the window in which the notebook is displayed on the screen.
Mathematica usually works by taking whatever input you give, and then processing it. Sometimes, however, you may want to have a program you write explicitly request more ...
Radical
(Mathematica Front End Token) "Radical" is a front end token that creates a SqrtBox and fills the base with a selection.
Cell Properties opens a submenu to select and toggle cell properties.
Page Break inserts a page break at the horizontal I-beam.
ChessboardDistance[u, v] gives the chessboard, Chebyshev, or sup norm distance between vectors u and v.
DefaultElement is an option for Grid and related constructs which specifies what to insert when a new element is interactively created.
DefaultFontProperties is a global option that specifies various properties of a font family, such as its character encoding and whether it is monospaced.
EndOfLine represents the end of a line in a string for purposes of matching in StringExpression.