gdk-window-set-icon-name (window name)

window -- a toplevel gdk-window object
name -- a strinng with the name of window while iconified (minimized)

Windows may have a name used while minimized, distinct from the name they display in their titlebar. Most of the time this is a bad idea from a user interface standpoint. But you can set such a name with this function, if you like.

After calling this with a non-nil name, calls to the function gdk-window-set-title will not update the icon title.

Using nil for name unsets the icon title; further calls to the function gdk-window-set-title will again update the icon title as well.