The UK variant of the Enhanced keyboard commonly used with personal computers designed for Microsoft Windows differs from the US layout as follows:
• The UK keyboard has 1 more key than the U.S. keybo… See more

The default U.S. layout on Apple Macintosh computers allows input of diacritical characters as the entire MacRoman character set is directly accessible. A U.S. international layout is also available.
Apple supp… See more

Other operating systems can optionally re-map the keyboard layout or have different modifier keys (for example the Amiga keyboard has "A" modifier keys and BBC Micro or Acorn keyboards often had a "Shift Lock" as w… See more