Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I just got a Matrox Dualhead2Go for use with my MacBook Pro. I realise that the reason it works is that it fakes 1 big (wide) monitor. I also kind of depended on the software that came with it to trick OSX into accepting it as 2 monitors.

Turns out the support is kind of lame: it just adds shortcuts for maximizing the window to whatever screen you want. And it even gets that wrong, since my dock doesn't auto-hide, but it doesn't take it in account while resizing, causing my window do end up "behind" my dock. (I've made a AppleScript that does the resize correctly, that I'll post below).

There's two glaring issues this causes: Full screen (video, etc.) takes up both monitors, and dialogs just pops up in the middle.

Is there a way to trick OSX, or at least a way to fix these issues?

share|improve this question
Thank you for posting this, I was just as frustrated by this limitation as well. At this point, I almost want to see if I can code my own solution. – Kyle Hayes Nov 13 '12 at 18:50
Kyle, at this point you may be better of getting a USB graphic card. They do what you want by definition, and there are a lot more options available than there were 2½ years ago, when I asked the question. – Sietse Nov 20 '12 at 12:43

The following AppleScript does a "correct" resize, provided your dock is 50px wide and your resolution is 1680*1050.

set _app to GetCurrentApp()

tell application _app
    set bounds of window 1 to {50, 1, 1680, 1050}
end tell

on GetCurrentApp()
    tell application "System Events"
        set _app to item 1 of (every process whose frontmost is true)
        return name of _app
    end tell
end GetCurrentApp

Tip: Create a new service using Automator, and paste the code in the workflow (there's a "Run actionscript" workflow thingy). This will allow you to assign a shortcut key to the resize action.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.