How to setup 3 external monitors to laptop using grandr and USB to VGA

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http://crunchbang.org – I need to be able to use 3 external dell monitors hooked up to my laptop, 1 being directly through the VGA port and 2 more using USB to VGA adapters The USB attached monitors aren't picked up automatically so I'm guessing some tweaking is in order, does anyone know where to start? (HowTos)