Selenium Core provides an additional mechanism for running automated tests called "HTA mode.“
An hta file is simply an html file but the extension “. hta” means that when we navigated to IE, it will apply same strict security measure
To run Selenium Core in HTA mode, just double-click on TestRunner.hta, in the /core directory of your Selenium installation.
Selenium RC Allow us to write automated web application in any programming language (Java, .NET, Perl, Python, Ruby, PHP) Selenium Remote Control provides a Selenium Server, which cans automatically start/stop/control, any supported browser The Selenium Server communicates directly with browser using AJAX Selenium Server acts as a client-configured HTTP proxy, to stand in between the browser and your website.
The Selenium Server is written in Java, and requires the Java Runtime Environment (JRE) version 1.5.0 or higher in order to start. You may already have it installed. Try running this from the command line:
Once you've got Java installed and ready to go, you can start the Selenium Server from the command line like this: