To Dulin: Windows or linux based os can both be installed on the same machines.
To defenderland: For one engine, there are numbers of fuels that can optimize combustion better than gas. The problem is cost, availability and legislation (it is considered illegal). It is similar to the open source vs non open source approach.
Someone who opened both ectaco jetbook color and onyx boox m92 found the same parts inside. Add to that that stylus of onyx and boox can work on both devices. The problem would have been a driver problem. My question is has anyone tried that: installing onyx firmware on ectaco (requires ectaco rooting of course or removing and replacing internal memory)?