The following sections of this BookRags Literature Study Guide is offprint from Gale's For Students Series: Presenting Analysis, Context, and Criticism on Commonly Studied Works: Introduction, Author Biography, Plot Summary, Characters, Themes, Style, Historical Context, Critical Overview, Criticism and Critical Essays, Media Adaptations, Topics for Further Study, Compare & Contrast, What Do I Read Next?, For Further Study, and Sources.
(c)1998-2002; (c)2002 by Gale. Gale is an imprint of The Gale Group, Inc., a division of Thomson Learning, Inc. Gale and Design and Thomson Learning are trademarks used herein under license.
The following sections, if they exist, are offprint from Beacham's Encyclopedia of Popular Fiction: "Social Concerns", "Thematic Overview", "Techniques", "Literary Precedents", "Key Questions", "Related Titles", "Adaptations", "Related Web Sites". (c)1994-2005, by Walton Beacham.
The following sections, if they exist, are offprint from Beacham's Guide to Literature for Young Adults: "About the Author", "Overview", "Setting", "Literary Qualities", "Social Sensitivity", "Topics for Discussion", "Ideas for Reports and Papers". (c)1994-2005, by Walton Beacham.
All other sections in this Literature Study Guide are owned and copyrighted by BookRags, Inc.
An extension of the lock and key, keyless entry systems were made possible in the 1970s with the advent of microchip technology. In principle, keyless entry systems are similar to combination locks because they require an alphanumeric code. This code has the advantage of being easily changed to improve security, but like the combination to a lock, must be memorized by the user to be effective. Early versions of keyless entry systems used keypads similar to those found on touch-tone telephones. Later models, using more advanced microchip technology, more closely resemble the keypad on a computer keyboard.
The major innovation in keyless entry systems has been the addition of remote control technology. Using a transmitter inside the remote control unit, locks can be opened from some distance with the press of a button. The remote keyless entry systems have several advantages. They eliminate the need for a keypad and alphanumeric code. In addition, it allows the holder to safely and quickly open a door without fumbling with traditional keys. Not surprisingly, remote keyless entry has found wide application in the automobile industry. Attached to the traditional ignition key, remote controls became virtually a standard feature in automobiles by the mid-1990s. Their use in homes is also expected to expand.