Do these things to AWS, if there is no AWS is not done, because basically online homework have a good AWS can take up the whole program, now these programs online at the same time almost three hundred people around, so if the AWS operation is not good, it will collapse. Before we use is not how good the server results often crash, then use the AWS like a lot, basically no problem, but also a lot of documents on the inside is also very convenient, because everyone should use this program, so if you can put in the AWS above it is that everyone can easily see the information and documents.