<P> Since the standard US keyboard layout in Microsoft Windows offers no way of inputting any sort of diacritic or accent, this makes it unsuitable for all but a handful of languages unless the US International layout is used . The US International layout changes the `, ~, ^, "(for _̈), and' (for _́) keys into dead keys for producing accented characters . The US International layout also uses the right alt (AltGr) as a modifier to enter special characters . Although there is no UK International layout on Windows, XP SP2 and above provide a UK Extended layout which, if activated, will allow the user to enter a wide variety of diacritics (such as grave accents) which are not accommodated by the standard UK layout . </P> <P> The non-standard default U.S. layout on Apple Macintosh computers allows input of diacritical characters, whereby the entire MacRoman character set is directly available, . Apple supplies a "British" keyboard layout with the following differences: </P> <Ul> <Li> The #symbol is replaced by the £ symbol (as on PC keyboards); the #is available by pressing ⌥ Option + 3 </Li> <Li> More recent Apple British keyboards move the backquote / ~ key to the left of the Z key and replace it with a section sign (§) and a plus - minus sign (±) respectively . </Li> <Li> The Enter key spans two rows and is shaped similarly to the Enter key of many ISO PC keyboards . </Li> </Ul> <Li> The #symbol is replaced by the £ symbol (as on PC keyboards); the #is available by pressing ⌥ Option + 3 </Li>

How to write at sign on english keyboard