Attachment Viewer

	You are being asked to supply the name of a command to execute
in order to view or otherwise process a particular attachment
type. 

	Hopefully, your mail system has been configured with a set of
default commands for most of the commonly used attachment types. If
one of these is displayed, select Accept to launch the program, but
first see the note below on stopping the external program. If there is
no default program, and you have no idea how to proceed, select
Cancel, which will then prompt you for a filename in which to save the
message attachment.
	If the attachment is of type "message" or "text", you may
use the string "MLVIEWER" to display the contents in an ML text
window.

	The following discussion is somewhat technical in nature,
because the external program is totally arbitrary, and this program
has no way of knowing the exact details required for its operation.

	The command to be executed is launched using the system shell
(normally "/bin/sh") -- which doesn't usually recognize the same
syntax as the typical login shell. For instance, the character "~" is
usually not interpreted by the system shell to refer to a home
directory. There are other minor differences, but this one is the most
noticeable; and likely to cause some confusion. If in doubt, please
refer to your system documentation, or seek the advice of a
knowledgeable administrator.

	If you supply a simple command name, the contents of the
message will be supplied to that command via the standard input
channel, which would otherwise be the keyboard. If the command
requires a filename to operate, you should place the sequence %s
within the command string, which will be replaced with the name of a
temporary file which will be created to hold the message
attachment. Only one %s is allowed in a command, and there should be
no other % characters.

	Do not run these commands in the background with "&" when
using a temporary file, because this program will resume and remove
the temporary file before the external command has a chance to access
it.

	If the external program requires terminal interaction, such as
keyboard input, you should preceed the command with an appropriate
sequence to launch an interactive terminal such as "xterm -e ".

Stopping the external program

	If a default command has been supplied, and you do not know
the details of how to stop it, it would be better to select Cancel at
this time, and save the attachment to a file instead. You can
experiment with it later from an interactive terminal, and not affect
your normal mail processing. Your normal mail processing will not
resume until the external command has completed normally and/or has
been terminated through some means.

Note:
	Since the program to be executed runs completely on its own,
in the event the sub-program refuses to quit normally, steps will need
to be taken to stop or kill the program from an interactive terminal
window or through other means.  This program has no way of controlling
the sub-program other than to start it running and supply an
attachment to it.