If you will run this project and use the BETA-version uour username must hav 6 letters. If you have 5 it is impossible register the agent. For avoid trouble use 6 letters from the beginning. If you only plan running the Standard client using 1 core you are not in need of 6 letters.
But if you lather plan to add a dual core you must change name.
You can run it on 4-cores too.
Their client runs as main.exe and is called elMATH
Read their message boards how you can do that.
Once an AMDuser always an AMD user