The Future Isn't What It Used to Be: Videotex Is on the Way.

Fuente: ERIC Institute of Education Sciences

Saved in:

Bibliographic Details
Main Author:	McKenzie, Jamieson A.
Format:	Recurso educativo Open Access
Language:	en
Published:	1984
Subjects:	Databases Educational Practices Educational Trends Elementary Secondary Education Futures (of Society) Home Programs Information Retrieval Information Seeking Information Services Library Role Online Systems Videotex
Online Access:	Acceder al recurso
Tags:	Add Tag No Tags, Be the first to tag this record!

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First Montreal Workshop on Videotex Technology. Document de travail #112.
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Videotex--The Library of the Future.
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Decision Points: Boolean Logic for Computer Users and Beginning Online Searchers.
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The Internet and TL's Role in the School: Possible, Probable and Preferred Futures.
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by: McKenzie, Jamie
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by: Pappas, Marjorie L.
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Videotex: Options for Libraries. Report Number Five of the Electronic Text Report Series.
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Published: (1984)

An Educated Collection for Homeschoolers.
by: Klipsch, Pamela R.
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The Idea of "Information Literacy" in the Age of High-Tech.
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by: Klingensmith, Patricia J.
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PDAs and the Library Without a Roof.
by: Foster, Clifton Dale
Published: (1995)

A Public Access Videotex Library Service.
by: Phillips, Roger
Published: (1982)

Reference beyond (and without) the Reference Desk.
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When Students Hit the Surf: What Kids Really Do on the Internet. And What They Want from Librarians.
by: Lubans, John, Jr.
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by: Saracevic, Tefko
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Telidon: A Videotext System.
by: Emmens, Carol A.
Published: (1982)

Multiple Database Access: More Users, More Considerations.
by: Hardin, Steve
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Homeschoolers and the Public Library.
by: Kleist-Tesch, Jane M.
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Shaking the Conceptual Foundations of Reference: A Perspective.
by: Campbell, Jerry D.
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The Internet Resource Directory for K-12 Teachers and Librarians. 1999/2000 Edition.
by: Miller, Elizabeth B.
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Imposed and Self-Generated Queries in the Elementary School Environment.
by: Gross, Melissa
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Videotex in Libraries and Information Centres.
by: Yeates, Robin
Published: (1986)

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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