LIBXRX(1)                                                            LIBXRX(1)


       libxrx - RX Netscape Navigator Plug-in


       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  appli-

       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.


       To install the RX Plug-in so that Netscape Navigator can use  it,  find
       the file named or (or similar, depending on
       your platform) in <ProjectRoot>/lib (e.g. /usr/X11R6.4/lib) and copy it
       to  either  /usr/local/lib/netscape/plugins or $HOME/.netscape/plugins.
       Do not install the symlinks or; they would  confuse

       If  you have configured Netscape Navigator 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 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: /usr/local/lib/netscape/plugins/

           X Remote Activation Plug-in

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

       Once  correctly  configured,  Netscape  Navigator  will activate the RX
       Plug-in whenever you retrieve any document of the  MIME  type  applica-


       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 run-
               ning 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:


               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

       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.


       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 proxym-
       ngr). When not specified it will use ":6500" as the default.


       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 infi-
       nite timeout since nobody knows when the application will actually con-
       nect 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


       xrx (1), xfwp (1), lbxproxy (1), proxymngr (1), The RX Document  speci-


       Arnaud Le Hors and Kaleb Keithley, X Consortium

X Version 11                      Release 6.6                        LIBXRX(1)

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