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.
WordCharacter represents a letter or digit character in StringExpression.
ZetaZero[k] represents the k\[Null]^th zero of the Riemann zeta function on the critical line.ZetaZero[k, t] represents the k\[Null]^th zero with imaginary part greater than ...
$Context is a global variable that gives the current context.
$InitialDirectory gives the initial directory when the current Mathematica session was started.
$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.
$MachineName is a string that gives the assigned name of the computer on which Mathematica is being run, if such a name is defined.
$SharedFunctions is the list of functions currently being shared among parallel kernels.
$SharedVariables is the list of variables currently being shared among parallel kernels.