Ian Griffiths goes into a thorough explanation about high-dpi monitors in his latest two entries. The first entry talks about Apple's new 30" monster monitor settling on 100dpi and how high dpi does not cause eyestrain, but OSs not supporting high-dpi is the cause. The second entry offers up an alternative monitor from ViewSonic called the VP2290b and once again he provides more information then you know about how monitors work and that he uses a 150dpi monitor with 9pt font.
After reading these entries, I was reminded of why Longhorn has introduced the new Length structure, a unit of measurement equal to 1/96th. So all you'll have to do is set the Length of button to 100 and Longhorn's rendering system will worry about how to scale the button dependant on the dpi of the current monitor.
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