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     LIBXRX(1)		X Version 11 (Release 6.4)	     LIBXRX(1)

     NAME    [Toc]    [Back]
	  libxrx - RX Netscape Navigator Plug-in

     DESCRIPTION    [Toc]    [Back]
	  The RX Plug-in may be	used with Netscape Navigator (3.0 or
	  later) to interpret documents	in the RX MIME type format and
	  start	remote applications.

	  The RX Plug-in reads an RX document, from which it gets the
	  list of services the application wants to use. Based on this
	  information, the RX Plug-in sets the various requested
	  services, including creating authorization keys if your X
	  server supports the SECURITY extension. It then passes the
	  relevant data, such as the X display name, to	the
	  application through an HTTP GET request of the associated
	  CGI script. The Web server then executes the CGI script to
	  start	the application. The client runs on the	web server
	  host connected to your X server. In addition when the	RX
	  document is used within the EMBED tag	(a Netscape extension
	  to HTML), the	RX Plug-in uses	the XC-APPGROUP	extension, if
	  it is	supported by your X server, to cause the remote
	  application to be embedded within the	browser	page from
	  which	it was launched.

     INSTALLATION    [Toc]    [Back]
	  The RX Plug-in is installed as libxrx.so in
	  /var/netscape/communicator/plugins. An N32 version is	also
	  installed in /var/netscape/communicator/plugins32.

	  If you have configured Netscape Navigator to use the RX
	  helper program (xrx)(not shipped by SGI), you	must
	  reconfigure it. Generally you	simply need to remove or
	  comment out the line you may have previously added in	your
	  mailcap file to use the RX helper program.  Otherwise	the
	  plug-in will not be enabled. (The usual comment character
	  for mailcap is ``#''.)

	  If you are already running Netscape Navigator, you need to
	  exit and restart it after copying the	plug-in	library	so the
	  new plug-in will be found.  Once this	is done	you can	check
	  that Navigator has successfully loaded the plug-in by
	  checking the ``About Plug-ins'' page from the	Help menu.
	  This should show something like:

				      RX Plug-in

	      File name: /var/netscape/communicator/plugins/libxrx.so

	      X	Remote Activation Plug-in

	      Mime Type		Description		     Suffixes

     Page 1					     (printed 10/9/01)

     LIBXRX(1)		X Version 11 (Release 6.4)	     LIBXRX(1)

	      application/x-rx	X Remote Activation Plug-in  rx

	  Once correctly configured, Netscape Navigator	will activate
	  the RX Plug-in whenever you retrieve any document of the
	  MIME type application/x-rx.

     RESOURCES    [Toc]    [Back]
	  The RX Plug-in looks for resources associated	with the
	  widget netscape.Navigator (class Netscape.TopLevelShell) and
	  understands the following resource names and classes:

	  xrxHasFirewallProxy (class XrxHasFirewallProxy)
		  Specifies whether an X server	firewall proxy (see
		  xfwp)	is running and should be used. Default is
		  ``False.''  The X firewall proxy uses	the X Security
		  Extension and	this extension will only allow clients
		  to connect to	the X server if	host-based
		  authentication is turned on.	See xfwp(1) for	more

	  xrxInternalWebServers	(class XrxInternalWebServers)
		  The web servers for which the	X server firewall
		  proxy	should not be used (only relevant when
		  xrxHasFirewallProxy is ``True''). Its	value is a
		  comma	separated list of mask/value pairs to be used
		  to filter internal web servers, based	on their
		  address. The mask part specifies which segments of
		  the address are to be	considered and the value part
		  specifies what the result should match. For instance
		  the following	list:,

		  matches the address sets: 198.112.45.* and
		  198.112.46.*.	More precisely,	the test is (address &
		  mask)	== value.

	  xrxFastWebServers (class XrxFastWebServers)
		  The web servers for which LBX	should not be used.
		  The resource value is	a list of address mask/value
		  pairs, as previously described.

	  xrxTrustedWebServers (class XrxTrustedWebServers)
		  The web servers from which remote applications
		  should be run	as trusted clients. The	default	is to
		  run remote applications as untrusted clients.	The
		  resource value is a list of address mask/value
		  pairs, as previously described.

     Page 2					     (printed 10/9/01)

     LIBXRX(1)		X Version 11 (Release 6.4)	     LIBXRX(1)

     ENVIRONMENT    [Toc]    [Back]
	  If the RX document requests X-UI-LBX service and the default
	  X server does	not advertise the LBX extension, the RX	Plug-
	  in will look for the environment variable ``XREALDISPLAY''
	  to get a second address for your X server and	look for the
	  LBX extension	there. When running your browser through
	  lbxproxy you will need to set	XREALDISPLAY to	the actual
	  address of your server if you	wish remote applications to be
	  able to use LBX across the Internet.

	  If the RX document requests XPRINT service, RX Plug-in looks
	  for the variable ``XPRINTER''	to get the printer name	and X
	  Print	server address to use. If the server address is	not
	  specified as part of XPRINTER, RX Plug-in uses the first one
	  specified through the	variable ``XPSERVERLIST'' when it is
	  set. When it is not RX Plug-in then tries to use the video
	  server as the	print server. If the printer name is not
	  specified via	XPRINTER, RX Plug-in looks for it in the
	  variables ``PDPRINTER'', then	``LPDEST'', and	finally

	  Finally, if you are using a firewall proxy, RX Plug-in will
	  look for ``PROXY_MANAGER'' to	get the	address	of your	proxy
	  manager (see proxymngr). When	not specified it will use
	  ":6500" as the default.

     KNOWN BUG    [Toc]    [Back]
	  When an authorization	key is created for a remote
	  application to use the X Print service, the RX Plug-in has
	  to create the	key with an infinite timeout since nobody
	  knows	when the application will actually connect to the X
	  Print	server.	It then	revokes	the key	when its instance is
	  destroyed (that is when you go to another page). However, if
	  the Plug-in does not get destroyed properly, which happens
	  when Netscape	Navigator dies unexpectedly, the print
	  authorization	key will never get revoked.

     SEE ALSO    [Toc]    [Back]
	  xrx (1), xfwp	(1), lbxproxy (1), proxymngr (1), The RX
	  Document specification

     AUTHORS    [Toc]    [Back]
	  Arnaud Le Hors and Kaleb Keithley, X Consortium

     Page 3					     (printed 10/9/01)

[ Back ]
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