XRX(1)							      General Commands Manual							    XRX(1)

NAME

       XRX - 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: 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:  Specifies
       whether	an  X server firewall proxy (see xfwp) is running and should be used. Default is ``False.'' 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.
       The web servers for which LBX should not be used. The resource value is a list of address mask/value pairs, as previously  described.   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''

       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

       lbxproxy (1),

       The RX Document specification

AUTHOR

       Arnaud Le Hors, X Consortium

																	    XRX(1)