PassEventsUp is an option to EventHandler that specifies whether events handled by a particular event handler should be passed up to event handlers in outer expressions.

PermutationReplace[expr, perm] replaces each part in expr by its image under the permutation perm.PermutationReplace[expr, gr] returns the list of images of expr under all ...

PolynomialQ[expr, var] yields True if expr is a polynomial in var, and yields False otherwise. PolynomialQ[expr, {var_1, ...}] tests whether expr is a polynomial in the var_i.

PrecedenceForm[expr, prec] prints with expr parenthesized as it would be if it contained an operator with precedence prec.

PrintTemporary[expr] prints expr as a temporary cell in a notebook, removing it when the evaluation of the current input line is complete.

ReadProtected is an attribute that prevents values associated with a symbol from being seen.

RenameDirectory["dir_1", "dir_2"] renames the directory dir_1 to dir_2.

RowLines is an option for the low-level function GridBox that specifies whether lines should be drawn between adjacent rows.

RowSpacings is an option for the low-level function GridBox that specifies the spaces in x heights that should be inserted between successive rows.

RuntimeOptions is an option for Compile that specifies runtime settings for the compiled function it creates.