StringToStream["string"] opens an input stream for reading from a string.
StyleBoxAutoDelete is an option for selections that specifies whether a StyleBox wrapped around them should be automatically removed when the expression is edited.
SyntaxPacket[integer] is a MathLink packet where integer indicates the position at which a syntax error was detected in the input line.
Visible
(Built-in Mathematica Symbol) Visible is a notebook option which specifies whether the notebook should be explicitly displayed on the screen.
WindowFloating is a notebook option that specifies whether the window for the notebook should float on top of other windows when it is displayed on the screen.
WindowOpacity is a notebook option that determines the overall opacity of a displayed window.
WindowStatusArea is a notebook option that specifies what should appear in the status area in the frame of the window used to display the notebook.
$MachineAddresses gives a list of strings specifying the current IP addresses associated with the computer on which Mathematica is being run.
$MachineDomains is a list of strings giving the names of the current network domains associated with the computer on which Mathematica is being run.
$ParentLink is the MathLink LinkObject currently used for input and output by the Mathematica kernel in a particular session.