Xbox sharing

My friend came over to our house last month, during a conversation he told me a bout his xbox and my brother heard it. After that, my brother told me that he is interested with this xbox. He is on a hobby of gaming, and if there is something new he gets curious. My friend left me with an xbox live 3 month code, I guess I have to give it to my brother. He had an xbox but had never been online ever since, I think a 3 month xbox live code would be exciting for him. According to my friend, this code will take you to the world of xbox sharing thing. I think it is very cool because there are lot of things you can get with this xbox live 3 month access. My brother is happy to know all of that.