Iconifies a window if it is not already iconified or de-iconifies it if it is already iconified. The optional argument bool is a boolean argument. "True" means only iconification is allowed, while "False" forces de-iconification. Using "toggle" switches between iconified and de-iconified states.

There are a number of Style options which influence the appearance and behavior of icons (e.g. StickyIcon, NoIcon).

For backward compatibility, the optional argument may also be a positive number instead of "True", or a negative number instead of "False". Note that this syntax is obsolete, and will be removed in the future.