InitializationCell is an option for Cell that specifies whether the cell should be tagged to be evaluated by the Mathematica kernel when the notebook that contains it is ...
LinkInterrupt[link] sends an interrupt to the program at the other end of the specified MathLink connection.
MaxExtraBandwidths is an option to SmoothKernelDistribution that controls the behavior outside that data range.
MaxPlotPoints is an option for plotting functions like ArrayPlot and ListPlot3D that specifies the maximum number of points that will explicitly be included in the output.
MultilaunchWarning is a global option that specifies whether a warning is given when you try to modify user preferences while running two copies of Mathematica simultaneously.
Notebooks[] gives a list of notebooks currently open in the front end.
Overlaps is an option to StringCases, StringCount, and StringPosition that specifies how to treat overlapping substrings.
RecordLists is an option for ReadList that specifies whether objects from separate records should be returned in separate sublists.
RowLines is an option for the low-level function GridBox that specifies whether lines should be drawn between adjacent rows.
RowsEqual is an option for the low-level function GridBox that specifies whether all rows in the grid should be assigned equal total height.