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As Unicode included all the characters in the MSDOS code pages, this had the immediate benefit that all the old MSDOS Alt combinations worked, not just the ones that existed in the Windows Code Page. In the IBM PC Bios typing an Alt code greater than 255 produced the same as that number modulo 256. [ 3 ]
Windows: Alt key codes. The alt keys (there are two of them) are easy to find on any Windows device—there’s one on either side of the space bar. ... To use alt key codes for keyboard shortcut ...
The Alt key is well known as part of the key combinations: Ctrl+Alt+Delete may restart the computer (its original function); in some operating systems it brings up a task manager - see Control-Alt-Delete. Alt+⌘ Cmd+Esc (often referred to as ⌘ Cmd+⌥ Opt+Esc.) brings up the Force Quit window in Apple's macOS, see Option key.
Unicode characters are distinguished by code points, which are conventionally represented by "U+" followed by four, five or six hexadecimal digits, for example U+00AE or U+1D310. Characters in the Basic Multilingual Plane (BMP), containing modern scripts – including many Chinese and Japanese characters – and many symbols, have a 4-digit code.
This page lists codes for keyboard characters, the computer code values for common characters, such as the Unicode or HTML entity codes (see below: Table of HTML values"). There are also key chord combinations, such as keying an en dash ('–') by holding ALT+0150 on the numeric keypad of MS Windows computers.
Ctrl+Alt+Show Windows then move mouse and click Copy screenshot of window to clipboard Ctrl+⇧ Shift+⌘ Cmd+4 then Space then move mouse and click: Alt+Print Screen : Ctrl+Alt+Show Windows then move mouse and click Save screenshot of arbitrary area as file ⇧ Shift+⌘ Cmd+4 then click+drag mouse over required area
A legacy of code page 437 is the number combinations used in Windows Alt codes. [6] [7] [8] A DOS user could enter a character by holding down the Alt key and entering the character code on the numpad [6] and many users memorized the numbers needed for CP437 (or for the similar CP850).
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