Canadian Sales Tax Calculator makes working with Harmonized Sales Tax (HST), Goods and Services Tax (GST) & Provincial Sales Tax (PST) easy.
The OS detects 1 screen for the DH2G (or TH2G), so you then must use software plugins that make so things only full screen to the 'physical screen', even though the logical screen in OSX spans multiple monitors. All monitors connected to the DH2G operate at the same resolution.