Help > Register this Mathematica... (Mathematica Menu Item)

Online Registration opens the Mathematica registration website.

Cell > Cell Tags > Show Cell Tags (Mathematica Menu Item)

Show Cell Tags toggles the display of cell tags in a notebook.

Evaluation > Debugger Controls >  Show ... (Mathematica Menu Item)

Show Debugger Tools Window toggles the display of the Debugger Tools window on or off.

Evaluation > Debugger Controls >  Show ... (Mathematica Menu Item)

Show Stack Window toggles the display of the evaluation stack window on or off.

[Right-click] > Speak Selection (Mathematica Menu Item)

Speak Selection speaks the contents of a single selected cell.

Evaluation > Debugger Controls > Step (Mathematica Menu Item)

Step makes the debugger stop at the beginning of the next expression.

mprep (Mathematica System Program)

mprep options template.tm preprocesses the MathLink template file template.tm, and generates C code that contains all the necessary MathLink code to call C functions from ...

Accumulate (Built-in Mathematica Symbol)

Accumulate[list] gives a list of the successive accumulated totals of elements in list.

Array (Built-in Mathematica Symbol)

Array[f, n] generates a list of length n, with elements f[i]. Array[f, {n_1, n_2, ...}] generates an n_1*n_2*... array of nested lists, with elements f[i_1, i_2, ...]. ...

BoxMatrix (Built-in Mathematica Symbol)

BoxMatrix[r] gives a (2 r + 1)*(2 r + 1) matrix of 1s.BoxMatrix[r, w] gives a (2 r + 1)*(2 r + 1) block of 1s centered in a w*w matrix of 0s.BoxMatrix[{r_1, r_2, ...}, ...] ...