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NAME
     libxrx - RX Netscape Navigator Plug-in

DESCRIPTION
     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  ser-
     vices,  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 applica-
     tion 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 con-
     nected 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 sup-
     ported 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 Netscape Navigator can use
     it,  find  the file named libxrx.so.6.3 or libxrx.sl.6.3 (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 libxrx.so or libxrx.sl; they
     would confuse Netscape.

     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 check-
     ing 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, Netscape Navigator 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 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 authentica-
             tion  is  turned  on.  See xfwp(1) for more informa-
             tion.

     xrxInternalWebServers (class XrxInternalWebServers)
             The web servers for  which  the  X  server  firewall
             proxy should not be used (only relevant when xrxHas-
             FirewallProxy 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 vari-
     ables   ``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 proxymngr). When  not  specified  it  will  use
     ":6500" as the default.

KNOWN BUG
     When an authorization key is created for a  remote  applica-
     tion  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  des-
     troyed  (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 author-
     ization key will never get revoked.

SEE ALSO
     xrx (1), xfwp (1), lbxproxy (1), proxymngr (1), The RX Docu-
     ment specification

AUTHORS
     Arnaud Le Hors and Kaleb Keithley, X Consortium

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