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XRX(1)			    General Commands Manual			XRX(1)

       xrx - RX	helper program

       xrx [-toolkitoption ...]	filename

       The  helper program may be used with any	Web browser to interpret docu-
       ments in	the RX MIME type format	and start remote applications.

       xrx reads in the	RX document specified by its filename, from  which  it
       gets  the  list of services the application wants to use. Based on this
       information, xrx	sets the various requested services, including	creat-
       ing  authorization  keys	 if your X server supports the SECURITY	exten-
       sion. 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	appli-
       cation.	The  client  runs  on  the web server host connected to	your X

       You need	to configure your web browser to use  xrx  for	RX  documents.
       Generally the following line in your $HOME/.mailcap is enough:
	     application/x-rx; xrx %s

       However,	 you may need to refer to your web browser's documentation for
       exact instructions on configuring helper	applications.

       Once correctly configured, your browser will activate the  helper  pro-
       gram whenever you retrieve any document of the MIME type	application/x-

       The xrx helper program accepts all of the standard  X  Toolkit  command
       line options such as:

       -xrm resourcestring
	       This  option  specifies a resource string to be used. There may
	       be several instances of this option on the command line.

       The application class name of the xrx program is	Xrx and	it understands
       the following application 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.''

       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 re-
	       sult 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  de-

       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.

       The xrx helper program uses the standard	X environment  variables  such
       as  ``DISPLAY'' to get the default X server host	and display number. If
       the RX document requests	X-UI-LBX service and the default X server does
       not  advertise  the  LBX	 extension,  xrx 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, xrx 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,  xrx  uses
       the  first  one specified through the variable ``XPSERVERLIST'' when it
       is set. When it is not xrx then tries to	use the	video  server  as  the
       print  server.  If  the printer name is not specified via XPRINTER, xrx
       looks for it in the variables ``PDPRINTER'', then ``LPDEST'',  and  fi-
       nally ``PRINTER'',

       Finally,	 if  you  are  using  a	 firewall  proxy,  xrx	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	helper program has to create the key  with  an
       infinite	 timeout since nobody knows when the application will actually
       connect to the X	Print server. Therefore, in this case, the helper pro-
       gram  stays  around  to	revoke	the key	when the application goes away
       (that is	when its video key expires). However, if  the  helper  program
       dies unexpectedly the print authorization key will never	get revoked.

       libxrx  (1),  xfwp  (1),	 lbxproxy  (1),	proxymngr (1), The RX Document

       Arnaud Le Hors, X Consortium

X Version 11			   xrx 1.0.4				XRX(1)


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