Links
(Built-in Mathematica Symbol) Links[] gives a list of all MathLink connections that are currently open. Links[patt] lists only links whose names match the specified string pattern.
Magnify
(Built-in Mathematica Symbol) Magnify[expr, r] represents an object to be displayed with magnification r. Magnify[expr] displays with expr magnified by a fixed factor.
NRoots
(Built-in Mathematica Symbol) NRoots[lhs == rhs, var] yields a disjunction of equations which represent numerical approximations to the roots of a polynomial equation.
Overscript[x, y] is an object that formats as OverscriptBox[x, y].
RadioButtonBar[x, {val_1, val_2, ...}] represents a radio button bar with setting x and with labeled radio buttons for values val_i.RadioButtonBar[Dynamic[x], {val_1, val_2, ...
Run
(Built-in Mathematica Symbol) Run[expr_1, expr_2, ...] generates the printed form of the expressions expr_i, separated by spaces, and runs it as an external operating system command.
ScheduledTasks[] returns a list of ScheduledTaskObject expressions that represent current tasks.
Selectable is an option for displayed objects, cells, and notebooks that specifies whether their contents can be selected interactively using the front end.
SpanCharacterRounding is an option for selections that specifies the method used for rounding a spanning character when its size is to be adjusted.
Underscript[x, y] is an object that formats as UnderscriptBox[x, y].