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[ubuntu] Launch an app in gnome onto a specific display (multi-monitor)

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linux-howto

http://ubuntuforums.org – I'm trying to launch an application on to a specific display. Yes, I know it's *supposed* to launch onto whatever window I have my mouse, but this doesn't happen. :) Doing: $ DISPLAY=":0.0" gnome-calculator launches the application fine, but any other numbers besides "0"s there causes an error, eg, (gnome-calculator:4211): Gtk-WARNING **: cannot open display: :1.0 Any ideas what the syntax is supposed to be for the $DISPLAY variable? More info: Nvidia cards, three displays, gnome not unity. A snippet from xorg.conf that may be relevant: Section " (Hardware)