AJAX from Scratch: Implementing Mutual Exclusion in JavaScript 
(Bruce Wallace) This AJAX from Scratch series of articles describes fundamental techniques needed to develop AJAX Rich Internet Applications in JavaScript from scratch. Each article focuses on a particular (usually little-covered) aspect of developing browser-side functionality without the use of commercial or server-based frameworks. The techniques described are additionally illustrated in Gravy, a small, but real-world, example JavaScript library and application.
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