Answer 54: Selenium core is the core JS engine of Selenium which executes tests on browser, but because of same origin policy it needs to be deployed on app server itself, which is not always feasible. Hence Selenium core is not used in isolation. Selenium IDE as well as Selenium RC use Selenium core to drive tests while overcoming same origin policy. In case of Selenium IDE tests are run in context of browser hence it is not hindered by same origin policy and with Selenium RC, Selenium Server over comes same origin policy.

Answer 55: Installation is a misnomer for Selenium RC. You don’t install Selenium RC you only add client libraries to your project.

For example in case of java you add client driver and Selenium server jars in Eclipse or IntelliJ which are java editors.

Answer 56: To start Selenium Server, you need to navigate to installation directory of Selenium server and execute following command –   

java -jar selenium-server.jar (This will start Selenium server at port 4444 by default).

Notice that you need to have java version 1.5 or higher available on your system to be able to use Selenium server.

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