XQueryTree(3X11)

     NAME
          XQueryTree - query window tree information

     SYNTAX
          Status XQueryTree(display, w, root_return, parent_return,
          children_return, nchildren_return)
                Display *display;
                Window w;
                Window *root_return;
                Window *parent_return;
                Window **children_return;
                unsigned int *nchildren_return;

     ARGUMENTS
          children_return
                    Returns the list of children.

          display   Specifies the connection to the X server.

          nchildren_return
                    Returns the number of children.

          parent_return
                    Returns the parent window.

          root_return
                    Returns the root window.

          w         Specifies the window whose list of children, root,
                    parent, and number of children you want to obtain.

     DESCRIPTION
          The XQueryTree function returns the root ID, the parent
          window ID, a pointer to the list of children windows (NULL
          when there are no children), and the number of children in
          the list for the specified window.  The children are listed
          in current stacking order, from bottom-most (first) to top-
          most (last).  XQueryTree returns zero if it fails and
          nonzero if it succeeds.  To free a non-NULL children list
          when it is no longer needed, use XFree.

     BUGS
          This really should return a screen *, not a root window ID.

     SEE ALSO
          XFree(3X11), XGetWindowAttributes(3X11), XQueryPointer(3X11)
          Xlib - C Language X Interface