the triple head to go doesnt replace anything - its a vga splitter- it takes a single vga output from your graphics card, and tells the computer its running a single wide screen.
if you havent used one before - you need to test it works with your system. not all systems and resolutions are supported.
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what do you mean "make sure your libraries work'?
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operating without dmx? - how easy it is? - depends on what you are used to- my presets do not and are not intended to replicate or replace a lighting console- but they do work - they are much simpler.