gdk-window-children-with-user-data (window user-data)

window -- a gdk-window object
user-data -- user data to look for as a :pointer

list of child windows inside window

Gets the list of children of the window known to GDK with a particular user-data set on it.

The returned list must be freed, but the elements in the list need not be.

The list is returned in (relative) stacking order, i.e. the lowest window is first.