Path: utzoo!attcan!uunet!lll-winken!lll-tis!helios.ee.lbl.gov!pasteur!agate!bionet!apple!bloom-beacon!ATHENA.MIT.EDU!swick
From: swick@ATHENA.MIT.EDU (Ralph R. Swick)
Newsgroups: comp.windows.x
Subject: Re: XDefineCursor with cursor = NONE
Message-ID: <8810211915.AA17030@LYRE.MIT.EDU>
Date: 21 Oct 88 19:14:55 GMT
References: <8810211634.AA11760@xpiinc.uu.net>
Sender: daemon@bloom-beacon.MIT.EDU
Organization: DEC/MIT Project Athena
Lines: 4

O'Reilly is wrong.  XUndefineCursor is equivalent to
XDefineCursor(cursor=None), both of which actually use the
ChangeWindowAttributes request.  Setting the
cursor of a root window to None is a special case, since the root window
doesn't have a parent.