Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. X64 Edition could refer to any number of editions of software that have been specifically built for x86-64 processor architectures. MOst often x64 Edition is used to refer to Windows XP Professional x64 Edition, a variation of the Windows XP operating system for x86-64 personal computers. COmputer software, or just software is a general term primarily used for digitally stored data such as computer programs and other kinds of information read and written by computers. TOday, this includes data that has not traditionally been associated with computers, such as film, tapes and records. THe term was coined in order to contrast to the old term hardware (meaning physical devices); in contrast to hardware, software is intangible, meaning it "cannot be touched".