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+.\" @(#)xtapemon.1 1.1 11-Dec-96 MJF
+.TH XTAPEMON 1 "11 Dec 1996" "X11IRAF Project"
+.SH NAME
+XTapemon \- magtape I/O status monitor and display utility for IRAF
+.SH SYNOPSIS
+\fBxtapemon\fP 
+[\-\fItoolkitoption\fP ...] [ \fI-port\fP <port> ] [ \fI\-a\fP ] [ \fI-d\fP ] 
+.SH OPTIONS
+In addition to the X Toolkit options, the following are supported:
+.TP 5
+.B "-port \fIport\fP"
+Set the primary port to listen on for client connections.  The default
+is 5138.
+.TP 5
+.B "-a"
+Listen on alternate port, this is the primary port number plus one.
+The default is 5139.
+.TP 5
+.B "-d"
+Debug mode, pass client message to the standard out.  The default is false.
+
+.SH "X RESOURCES"
+\fBXTapemon\fP options can appear on the command line or in your X
+resource file.  Options on the command line supercede values
+specified in your X resource file.
+
+.TP 12
+.B "port"
+Set the primary port to listen on for client connections.  The default
+is 5138.
+.TP 12
+.B "alternate"
+Listen on alternate port, this is the primary port number plus one.
+The default is 5139.
+.TP 12
+.B "debug"
+Debug mode, pass client message to the standard out.  The default is false.
+.SH DESCRIPTION
+.LP
+Xtapemon is a magtape status monitor and display utility.  You use it to
+display the status of a IRAF tape job while it is running.  TCP/IP sockets
+are used for communication, so the IRAF tape job and xtapemon may be on
+the same host machine or on different hosts.  All V2.10 versions of IRAF
+support tape status output (including even VMS/IRAF).  For example, suppose
+our workstation is named \fIcygnus\fP and we are running IRAF on host 
+\fIregulus\fP, using magtape device mta.  The first step is to
+start xtapemon on cygnus:
+
+        % xtapemon &
+
+Then in IRAF on regulus we might do the following:
+
+        cl> set tapecap = ":so=cygnus"
+        cl> allocate mta
+        cl> rewind mta
+
+At this point the IRAF magtape i/o driver executing on regulus should open
+a connection to the xtapemon tape monitoring server running on cygnus, and
+indicate that a rewind operation is taking place.
+
+If both xtapemon and the IRAF tape job are running on the same host then
+the hostname can be omitted, e.g. "set tapecap = :so".  The use of
+"set tapecap" assumes that the default IRAF tapecap is being used.  If
+the user has a private tapecap, the syntax is
+
+        cl> set tapecap = "<my-tapecap-file>:so=hostname"
+
+In general you can append any number of tapecap device capability overrides
+(the :xx fields) to the tapecap environment specification.  Alternatively, 
+the :so can be specified on the command line, e.g.
+
+        cl> rewind "mta[:so=cygnus]"
+
+But in general it will be more convenient to use set tapecap.
+
+It is safe to have :so (status output) enabled even if there is no xtapemon
+server;  IRAF will try to make the connection but will proceed without any
+indication of an error if the status output connection cannot be established.
+
+
+The amount of tape read or written in Mb will be accurate only if the IRAF
+magtape driver actually reads or writes all the data between the beginning
+of tape and the current position of the tape.  Hence, if one rewinds the
+tape and then reads or writes a number of tiles, the Mb used field will be
+accurate.  If however one does a skip to a random file somewhere far down on
+the tape, IRAF will not have read the data and the tape used field will
+indicate only the data actually read or written.  For example, a rewind
+followed by a \fImtexamine\fP will reliably indicate the actual amount of data
+on the tape, leaving the tape positioned to EOT.  If one then appends new files
+to the tape the tape used field will still be accurate.  If however one pops
+in a new tape and then appends a file at EOT, tape used will be invalid as
+the drive will rapidly skip forward to the EOT.
+
+.SH "ADVANCED USAGE"
+
+By default xtapemon listens on the port 5138, called port A.  If when you
+start the xtapemon server this port is already busy, xtapemon will
+automatically switch to port B instead (the alternate port, 5139).  This 
+makes it possible to monitor two tape jobs at the same time.
+
+If you have xtapemon servers running on two ports it will be necessary to
+tell the second IRAF tape job what port to use, since the magtape driver
+will use port A by default.  For example,
+
+        cl> set tapecap = ":so=cygnus,5139"
+or
+        cl> mtexamine "mta[:so=,5139]"
+
+If there is some problem using the builtin port defaults you can use any
+port you want.  The following resources tell which port to use.
+
+        XTapemon.port		# port A
+        XTapemon.alternate		# port B
+
+Or you can specify the ports with the argument "-port" or "-a" (alternate)
+on the command line when xtapemon is started.
+.SH BUGS
+You can't necessarily trust displayed information such as the device type and
+tape type.  On most platforms this information is taken from the tapecap
+entry for the device, and the accuracy of this information will depend upon
+the diligence of your IRAF system adminstrator when they configured tapecap
+for your site (and on whether you use the correct logical device name for
+the drive and tape capacity you are using).
+
+Xtapemon tries to keep track of the amount of tape used: the number of Mb
+(megabytes) read or written is displayed, along with the percent of the tape
+used.  Whether or not the percent used field is accurate depends upon a
+number of factors.  First the tape capacity given in the tapecap file must
+match the actual tape being used.  Second, if data compression is in use on
+the drive, xtapemon will display the uncompressed quantity of data written.
+On a compression drive percent used can be greater than 100%!
+.SH SEE ALSO
+xgterm(1), ximtool(1)
+.SH COPYRIGHT
+Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.