The top of Selenium releases has always been a mess. The significant difference between Selenium 1 and 2 is that Selenium 1 used the Selenium remote control interface, and Selenium 2 is based on WebDriver. This means: Selenium 2 tests are those that you write in code, for example. in Java, in an object oriented fashion. Everything you record or a script using the Selenium IDE uses the Selenium RC interface, which still works with Selenium 2 for backward compatibility. So there is no Selenium IDE 2.
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