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+>Window Manager Protocols</TITLE
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+><H1
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+><A
+NAME="AEN340"
+>6. Window Manager Protocols</A
+></H1
+><DIV
+CLASS="SECT2"
+><H2
+CLASS="SECT2"
+><A
+NAME="AEN342"
+>6.1. _NET_WM_PING</A
+></H2
+><P
+>This protocol allows the Window Manager to determine if the Client is still
+processing X events.  This can be used by the Window Manager to determine if a
+window which fails to close after being sent WM_DELETE_WINDOW has stopped
+responding, or has stalled for some other reason, such as waiting for user
+confirmation.  A Client SHOULD indicate that it is willing to participate in
+this protocol by listing _NET_WM_PING in the WM_PROTOCOLS property of the
+client window.
+		</P
+><P
+>A Window Manager can use this protocol at any time by sending a client message
+as follows:
+		</P
+><PRE
+CLASS="PROGRAMLISTING"
+>type = ClientMessage
+window = the respective client window
+message_type = WM_PROTOCOLS
+format = 32
+data.l[0] = _NET_WM_PING
+data.l[1] = timestamp</PRE
+><P
+>A participating Client receiving this message MUST send it back to the root
+window immediately, by setting window = root, and calling XSendEvent.  The
+Client MUST NOT alter the timestamp, as this can be used by the Window Manager
+to uniquely identify the ping.
+		</P
+><P
+>The Window Manager MAY kill the Client (using _NET_WM_PID) if it fails to
+respond to this protocol within a reasonable time.
+		</P
+><P
+>See also the implementation notes on <A
+HREF="x351.html#KILLINGWINDOWS"
+>killing hung processes</A
+>.
+		</P
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+>&nbsp;</TD
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