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begin
    prog = irexec
    remote = mx600_cable_043
    button = On
    repeat = 0
    delay = 10
    config = /usr/bin/xscreensaver-command -deactivate; echo 'Press
    button again within three seconds to restart MythTV' |
    /usr/local/bin/putfifo /tmp/onscreen && ~/bin/mythpowerbutton &
end

The kill button only functions if it is pushed twice within three
seconds; otherwise it simply displays a message on the screen through
putfifo (a little utility I found for this purpose since I didn't like
mythtvosd's output) and, incidentally, also turns off the screensaver
if running. The contents of my mythpowerbutton script:

#!/bin/bash
PROG=mythfrontend
STATUS=`ps -e | grep $PROG | grep -v grep | wc -l | awk '{print $1}'`

if [ `echo $DISPLAY | grep -c ":0"` -ge 1 ]
    then
    if [ $STATUS -eq 0 ]
        then

        ( $PROG & )
    else

#       play /usr/share/sounds/gtk-events/toggled.wav

        if [ -a /tmp/mythpowerbutton-off ]
            then
            touch /tmp/mythpowerbutton-on;

            exit;
        else

            touch /tmp/mythpowerbutton-off;
            sleep 3;
            if [ -a /tmp/mythpowerbutton-on ]
                then

                play /usr/share/sounds/gtk-events/activate.wav

                rm -rf /tmp/mythpowerbutton-o* && killall $PROG
            fi
            rm -rf /tmp/mythpowerbutton-o*
        fi
        rm -rf /tmp/mythpowerbutton-o*
    fi
fi

exit 0

-- 
Frontend:		P4 3.0GHz, 1.5TB software RAID 5 array
Backend:		Quad-core Xeon 1.6GHz, 6.6TB sw RAID 6
Video inputs:		Four high-definition over FireWire/OTA
Accessories:		47" 1080p LCD, 5.1 digital, and MX-600