Forex is one of those things that are becoming more and more popular among those who want to make solid amount of money in a year or two. And since changing the money on your own and looking after the news and speculations all the time can take you a lot of time people have started to use software that helps people at forex trading.
There are a lot of online software trading platforms that match different people, ones are made for experts and the others are meant to be used by complete beginners. The important thing or at least a very good thing before going on a forex market is to be familiar with the platform (software) you will be using. Since you are not allowed to make a mistake and lose money, you should first try out a demo version of a platform (if available) or check out the complete system that your friend is using. From the experience of people that I know the best platform to start with, is Meta Trader 4. People like it because of its simplicity of use and available demo platform version. Others that have started with platform called VT Trader say, that it took them quite some time to get on with all the options but once they found out how everything stands they did not have any problems with it and prefer it over Meta Trader 4.
After all the platform or software that you are using isn't as important as the money you can make changing currencies. Find the platform that suits you and good luck.