The &xbutton; widget simply displays a button with the
&xwp; "X"
eComStation
logo on it. If you press that button, a menu will open which gives you access
to functions like shutdown, suspend, logoff, and "Restart Desktop".
Besides, the &xbutton; menu will display the contents of the Desktop, just
like the regular &xwp; folder content menus do.
You can change the menu items and the bitmap that is displayed by right-clicking
on the &xbutton; and selecting "Properties".