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Hi TMP, you'll need a dual head video card (known as dual output) and another lead to connect it.
Firstly, is the 19" monitor you have at the moment DVI or VGA?
Many can actually take a VGA input even if they have a DVI socket but this will depend on the spec/compatibilty of your monitor. I won't go in to specialist converter cables until you've figured out what you need though.
You can then buy another monitor, preferably with the same type of connection, and simply plug from the second output on the video card to the monitor.
The layout is software configurable; clone (two matching sceens) or extended desktop (where the second monitor is a continuation of the first - you want to select this one). There are other setting but these are more or less variations of these two.
I recommend the ATI cards as they don't run cpu heavy background tasks and the software is very intuative.
Let me know if you need more in depth info as I used to do this sort of thing to pay the rent......
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