xSGE is a collection of extensions for the SGE licensed under the GNU
General Public License. They are designed to give additional features
to free/libre software games which aren't necessary, but are nice to
have.

xSGE extensions are not dependent on any particular SGE implementation.
They should work with any implementation that follows the specification.

This extension provides a simple toolkit for adding GUIs to a SGE game
as well as support for modal dialog boxes.