In 2001, Erik J. Barzeski created a little PHP 4 application called Techstra that bridged the gap between an author and his readers. Designed for programming books, it featured a page-search mechanism that shows author and reader comments and question, errata, hints, and exercise solutions.
In 2008, Aaron Hillegass updated his Cocoa Programming book and I decided to create a brand new version of Techstra. The only thing it shares with the original version is its basic purpose.
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