This is an optimum format to be viewed on portable devices. There are players for Windows PCs, devices PalmOS, SymbianOS and Blackberry, as well as electronic ink books (iRex Iliad, Cybook, Bebook and Hanlin). Some players can adjust the font size to the needs of the reader, and even consult a dictionary search. It is worth consulting the software download page from the manufacturer to see the full list players.