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From: RWS@ZERMATT.LCS.MIT.EDU (Robert Scheifler)
Newsgroups: comp.windows.x
Subject: ButtonPress events
Message-ID: <871030080856.8.RWS@KILLINGTON.LCS.MIT.EDU>
Date: Fri, 30-Oct-87 08:08:00 EST
Article-I.D.: KILLINGT.871030080856.8.RWS
Posted: Fri Oct 30 08:08:00 1987
Date-Received: Wed, 4-Nov-87 21:20:37 EST
References: <970@hplabsz.HPL.HP.COM>
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    Date: 29 Oct 87 19:23:03 GMT
    From: hplabsz!dayoung@hplabs.hp.com  (Doug A. Young)

    "at most one client at a time can select for ... ButtonPressMask"

As the start of that Xlib paragraph tried to indicate, this is a
restriction on any given window, not on the entire collection of
windows.  The restriction is that on a given window, two independent
clients cannot both select for ButtonPressMask (because the button press
initiates a grab, and it wouldn't be obvious which client should be the
grabber).