LIBXRX(1)						      General Commands Manual							 LIBXRX(1)

NAME

       libxrx - RX Web Browser Plug-in

DESCRIPTION

       The RX Plug-in may be used with web browsers in the Mozilla family, including Netscape Navigator (3.0 or later), Firefox, and SeaMonkey, 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

       To  install  the  RX  Plug-in so that the web browser can use it, find the file named libxrx.so or libxrx.sl (or similar, depending on your
       platform) in __ProjectRoot__/lib and copy it to the browser plugin directory in the system installation or your	home  directory  (such	as
       /usr/lib/firefox/plugins or $HOME/.firefox/plugins).

       If  you have configured the web browser to use the RX helper program (xrx), 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 the web browser, 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 the browser 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: /usr/local/lib/netscape/plugins/libxrx.sl.6.3

	   X Remote Activation Plug-in

	   Mime Type	     Description		  Suffixes  Enabled
	   application/x-rx  X Remote Activation Plug-in  xrx	    Yes

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

RESOURCES

       The RX Plug-in looks for resources associated with the widget netscape.Navigator (class Netscape.TopLevelShell) and understands the follow-
       ing 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 information.

       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:

		     255.255.255.0/198.112.45.0, 255.255.255.0/198.112.46.0

	       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.

ENVIRONMENT

       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 ``PRINTER'',

       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  prox-
       ymngr). When not specified it will use ":6500" as the default.

KNOWN BUG

       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
       the browser dies unexpectedly, the print authorization key will never get revoked.

SEE ALSO

       xrx (1), xfwp (1), lbxproxy (1), proxymngr (1), The RX Document specification

AUTHORS

       Arnaud Le Hors and Kaleb Keithley, X Consortium

X Version 11							     xrx 1.0.3								 LIBXRX(1)