DVORAK mode on the Advantage USB and Pro USB is just a automatic remapping. The boards are fully remappable in onboard hardware, and when you "switch" it to DVORAK or back to QWERTY, it just remaps itself. This makes for a pain if you want to swap frequently between the two layouts, as it overwrites any custom remapping you've done with the standard DVORAK or QWERTY layout every time you "switch" it. Kinesis recommends using macros rather than remapping to swap key function if you need to use the auto Qwerty/Dvorak remap feature, since macros operate below the remap level, and remain intact after remapping.