For Chrome OS with US-Extended keyboard setting, the combination is . For Chrome OS with UK-extended setting, use , release, then the letter. Alternatively, the Unicode codepoint may be entered directly, using , release, then the four-digit code, then or . In some Linux desktop environments a letter with double dots can be produced by pressing , then the letter. Microsoft Windows allows users to set their US layout keyboard language to "International", which supports creation of accented letters by changing the function of some keys into dead keys. If the user enters ", nothing will appear on screen, until the user types another character, after which the characters will be merged if possible, or added independently at once if not. Otherwise, the desired character may generated using the Alt table above. When using Microsoft Word or Outlook, a letter with double dots can be produced by pressing and then the letter. X-based systems with a Compose key set in the system can usually insert characters with double dots by typing , (i.e. ") followed by the letter. , may also work, depending on the system's set-up. However, most modern UNIX-like systems also accept the sequence to initiate the direct input of a Unicode value. Thus, typing , 00F6, finishing with or , will insert ö into the document. The German keyboard has dedicated keys for "ü ö ä". Scandinavian and Turkish keyboards have dedicated keys for their respective language-specific letters, including "ö" for Swedish, Finnish, and Icelandic, and both "ö" and "ü" for Turkish. For non-Latin scripts, Greek and Russian use press-and-hold for double-dot diacritics on only a few characters. The Greek keyboard has dialytica and dialytica–tonos variants for upsilon and iota (ϋ ΰ ϊ ΐ), but not for ε ο α η ω, following modern monotonic usage. Russian keyboards feature separate keys for е and ё. The early 21st century has seen noticeable growth in stylus- and touch-operated interfaces, making the use of on-screen keyboards operated by pointing devices (mouse, stylus, or finger) more important. These "soft" keyboards may replicate the modifier keys found on hardware keyboards, but they may also employ other means of selecting options from a base key, such as right-click or press-and-hold. Soft keyboards may also have multiple contexts, such as letter, numeric, and symbol.