Hot answers tagged multiple-displays
That's not really what you wanted, but have you tried this arrangement?
Unless you bought a very old iMac, its external display port is most likely mini-DVI. If you have something as old as a G4 (the "desk lamp"-looking iMacs), it may be a mini-VGA port. A helpful resource for identifying your model and seeing details of its capabilities is everymac.com - those are the only options I see for any of the 17-inch iMac models.
No, what you're asking for doesn't even make sense. If you want the display to be mirrored, then what's on the external display has to be exactly the same as what's on the internal display. What you need is a new external display with a larger physical screen size.
To the best of my knowledge a 'Thunderbolt to twin VGA' adapter does not exist. I think what The Projector Company are suggesting are the Matrox DualHead2Go adapter boxes. The premise of these adapters is they connect to two displays (or projectors) and present a single connection to the computer. They present the two displays as a single super-wide display ...
I have a similar setup and now that I'm thinking about this, using Spaces is the key. Go to System Preferences > Mission Control Enable "Displays have separate spaces" In the Dock, right-click (or option-click) an app. Under Options, assign that app to the appropriate space and display. I'm currently at home where I only have a single external monitor ...
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