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Because when you open an xterminal, there is an environment variable called DISPLAY.

$ echo $DISPLAY
:0
$ set | grep DISPLAY
DISPLAY=:0

However, when you run it in rc, the DISPLAY...

Can't really put that in /etc/rc.local because the program synclient need to contact the X server.

OK there is some further details need to take note about the script synclient, there must be no...