Phoenix Viewer is just like Emerald Viewer. It is a viewer for Second Life. So, you will need an account on Second Life. There are multiple versions of the program depending on the type of hardware you have. Program is available for Linux too. We are given a small virtual world where we can move our avatar around and do modifications. We can also chat with others. This requires a high speed internet. The graphics are not that good even in 'ultra' mode. But that means you won't need a separate graphics card to run the program.