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  2. Undefined value - Wikipedia

    en.wikipedia.org/wiki/Undefined_value

    An undefined value must not be confused with empty string, Boolean "false" or other "empty" (but defined) values. Depending on circumstances, evaluation to an undefined value may lead to exception or undefined behaviour, but in some programming languages undefined values can occur during a normal, predictable course of program execution.

  3. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection. [2]A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD.

  4. Query string - Wikipedia

    en.wikipedia.org/wiki/Query_string

    A query string is a part of a uniform resource locator that assigns values to specified parameters.A query string commonly includes fields added to a base URL by a Web browser or other client application, for example as part of an HTML document, choosing the appearance of a page, or jumping to positions in multimedia content.

  5. Page fault - Wikipedia

    en.wikipedia.org/wiki/Page_fault

    The operating system delays loading parts of the program from disk until the program attempts to use it and the page fault is generated. If the page is not loaded in memory at the time of the fault, then it is called a major or hard page fault. The page fault handler in the OS needs to find a free location: either a free page in memory, or a ...

  6. HTTP 404 - Wikipedia

    en.wikipedia.org/wiki/HTTP_404

    Help; Learn to edit; Community portal; Recent changes; Upload file; Special pages

  7. Undefined - Wikipedia

    en.wikipedia.org/wiki/Undefined

    This is an accepted version of this page This is the latest accepted revision, reviewed on 9 January 2025. Look up undefined in Wiktionary, the free dictionary. Undefined may refer to: Mathematics Undefined (mathematics), with several related meanings Indeterminate form, in calculus Computing Undefined behavior, computer code whose behavior is not specified under certain conditions Undefined ...

  8. Undefined (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Undefined_(mathematics)

    In mathematics, the term undefined refers to a value, function, or other expression that cannot be assigned a meaning within a specific formal system. [ 1 ] Attempting to assign or use an undefined value within a particular formal system, may produce contradictory or meaningless results within that system.

  9. Help:Searching from a web browser - Wikipedia

    en.wikipedia.org/wiki/Help:Searching_from_a_web...

    To get Wikipedia search results while on any web page, you can temporarily set your browser's (web-based) search box to interface the Wikipedia search engine and land on Wikipedia's search results page. This trick removes the need to first navigate to Wikipedia from a web page, and then do the search or navigation. It is a temporary change, and ...