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XQueryTree - query window
tree information 
- Status XQueryTree(Display *display, Window w, Window
- *root_return, Window *parent_return, Window **children_return, unsigned
int *nchildren_return);  
Returns the list of children. 
Specifies
the connection to the X server. 
Returns the number of children. 
Returns the
parent window. 
Returns the root window. you want to obtain 
Specifies the
window whose list of children, root, parent, and number of children. 
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.
  
This really should return a screen *, not a root window ID. 
XFree(3X11)
,
XGetWindowAttributes(3X11)
, XQueryPointer(3X11)
 
Xlib - C Language X Interface 
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