gtk:window-title (object)

object -- a gtk:window widget
title -- a string for the title of the window

The accessor for the title slot of the gtk:window class gets or sets the title of the window.

The title of a window will be displayed in the title bar. On the X Window System, the title bar is rendered by the window manager, so exactly how the title appears to users may vary according to the exact configuration. The title should help a user distinguish this window from other windows they may have open. A good title might include the application name and current document filename.