Remote Access

When you think of the word, remote access, you would think that it means that you can remotely access a computer and control it, to some degree. I am I right in assuming this? If so, how do you do it, what are the limitations? I am trying to access some stuff on my computer at home that will help my wife take care of some stuff while I am deployed. For instance, some of the sites that I need to guide her around on the internet, I cant do because they are blocked here, could she go to the site and I see and control the process to get her where she needs to be?