XRX(1)							      General Commands Manual							    XRX(1)

NAME

       xrx - RX helper program

SYNOPSIS

       xrx [-toolkitoption ...] filename

DESCRIPTION

       The helper program may be used with any Web browser to interpret documents 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 creating 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 application. The client runs on the web server host connected  to  your  X
       server.

INSTALLATION

       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 program whenever you retrieve any document of the MIME type application/x-
       rx.

OPTIONS

       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.

RESOURCES

       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 running 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 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

       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  environ-
       ment  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 finally ``PRINTER'',

       Finally, if you are using a firewall proxy, xrx 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 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
       program	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.

SEE ALSO

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

AUTHOR

       Arnaud Le Hors, X Consortium

X Version 11							     xrx 1.0.3								    XRX(1)