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"IETester is a free (both for personal and professional usage) WebBrowser that allows you to have the rendering and javascript engines of IE10 preview, IE9, IE8, IE7 IE 6 and IE5.5 on Windows 7, Vista and XP, as well as the installed IE in the same process. "

"Programmers take certain features for granted - sequential programming for instance, writing down an algorithm that does one thing after the other. RelatedVendorContent State of Agile Development Survey Results & Summary Architecting the Ultimate Service Security Control Point 2010 Open Source Integrity Report: Defect Scan of 291 Key Projects Including Android Kernel DataPower: Messaging, ESB, Cloud, Security as an Appliance The Agile Tester However, if you're writing code in Javascript that uses blocking I/O or other long running operations, sequential coding is out of the question because blocking the only thread in the system is a very bad idea. The solution is to implement algorithms using asynchronous callbacks, ie. spread out sequential code over multiple callbacks."