Kernels[] gives the list of running kernels available for parallel computing.

OrderedQ[h[e_1, e_2, ...]] gives True if the e_i are in canonical order, and False otherwise.

PaneSelector[{v_1 -> expr_1, v_2 -> expr_2, ...}, v] represents an object that displays as a pane containing the expr_i for which v_i is equal to v.

Trigger[Dynamic[u]] represents a trigger that can be pressed to make the dynamically updated value of u be continually increased with time from 0 to 1. Trigger[Dynamic[u], ...

ViewAngle is an option for Graphics3D and related functions which gives the opening half-angle for a simulated camera used to view the three-dimensional scene.

Nested logical and piecewise functions can be expanded out much like nested arithmetic functions. You can do this using LogicalExpand and PiecewiseExpand. Expanding out ...

Manipulating global options in the front end. Just like cells and notebooks, the complete Mathematica front end has various options, which you can look at and manipulate from ...

$SQLTimeout gives the default time in seconds that DatabaseLink waits while opening connections and executing database queries.

MarshalStringsAs is an option to DefineDLLFunction that specifies how string arguments should be marshaled into the DLL function. This applies to any arguments that are ...

$CCompilerDefaultDirectory returns the default location for creating output.