I have created a project in Eclipse for Selenium automation using testNG framework. I have never used any user extension file in the past, but I heard that we need to use an user extension file. As since I am unsure of the proper use of this file I have never used it and my project runs smoothly. The question now arises is that later on will I have any issues because of not using an user-extension file? Please give me some ideas on the user extension file and let me know whether its mandatory to use in selenium RC project.
thanks in advance