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Many Unicode characters are used to control the interpretation or display of text, but these characters themselves have no visual or spatial representation. For example, the null character (U+0000 NULL) is used in C-programming application environments to indicate the end of a string of characters.
The C0 and C1 control code or control character sets define control codes for use in text by computer systems that use ASCII and derivatives of ASCII. The codes represent additional information about the text, such as the position of a cursor, an instruction to start a new line, or a message that the text has been received.
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One convention is for the page author to show the access key value by using the <u> tag to underline the letter in the link’s text corresponding to the accesskey assigned. For the link below, a user would press Alt + H on Internet Explorer, Ctrl + H on a Mac (the command key can give undesired results) and ⇧ Shift + Esc + H on Opera to be ...
The user can customize fonts, colors, positions of links in the margins, and many other things! This is done through custom Cascading Style Sheets stored in subpages of the user's "User" page.
In other words, it does not matter whether the key would have produced an upper-case or a lower-case letter. The interpretation of the control key with the space, graphics character, and digit keys (ASCII codes 32 to 63) varies between systems. Some will produce the same character code as if the control key were not held down.
The leading zero is required; if it is omitted, a character corresponding to the code point in the default OEM code page is entered. For example, if the OEM default is code page 437, Alt+150 gives û. On a computer running the Microsoft Windows operating system, many special characters that have decimal equivalent codepoint numbers below 256 ...
In this table, The first cell in each row gives a symbol; The second is a link to the article that details that symbol, using its Unicode standard name or common alias.