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This question already has an answer here:

Is there a way to connect Dell Latitude E4310 with one VGA to 2 external monitors without using a docking station?

marked as duplicate by Ƭᴇcʜιᴇ007, Tog, Kevin Panko, Dave, Raystafarian Mar 13 '14 at 13:17

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There are usb to vga adapters which are basically external "graphics cards" . They require software to be installed but aren't very expensive, very portable, and pretty easy to use.

http://www.startech.com/AV/USB-Video-Adapters/USB-VGA-Adapter-External-Video-Card-PC-Mac~USB2VGAPRO2

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