You have to register online and sign up to take it at one of the prometric centers around where you live.
For the actual test you sit in cubicles with your own computer and noise blocking headphones that are rather uncomfortable to wear for extended periods of time. It's all electronic and all you get are 2 small sheets of lamented graph paper that you can write on using dry erase markers that they provide for you. There is no scantron to use , and you get your scores at the end of your testing session.