Convert To opens a submenu for converting a cell to another form, format, or display form.

FormBox[boxes, form] is a low-level box construct which displays as boxes but specifies that rules associated with form should be used to interpret boxes on input.

CellEvaluationDuplicate is an option for Cell which specifies whether the front end should make a copy of the cell before performing any evaluation of its contents that you ...

InputAutoReplacements is an option for cells and notebooks which specifies strings of characters that should be replaced immediately on input.

Palettes can be configured to remember their previous states across front end sessions. This is useful for palettes containing multiple expandable sections, tab views, ...

FindSettings -> {opt_1 -> val_1, opt_2 -> val_2, ...} is a global option that specifies settings for the Find dialog box.

Manual represents an option or other value that is to be selected manually, usually by some form of interactive manipulation.

$Canceled is a symbol returned when notebook input is canceled, for example from a dialog box.

Animate Selected Graphics animates graphics in a selection of cells, typically a cell group.

Mathematica not only fits into standard accessibility frameworks, but also provides its own highly flexible interface accessibility options.