With Roaming Profiles, the idea is the following.
On a normal desktop without roaming profiles, when you log off or close the machine, Windows saves the desktop and user settings to the local User Profile. When you open Windows again, it searches for the user and loads it again. So, on computer A, if you add five icons and change your wall paper and screen saver, etc. it will be saved locally but nowhere else. So, when you go to another computer and log in, you will not see the new wallpaper or icon, etc.
With Roaming Profiles, when you log into the computer, it doesn't look to the local profile, it looks to the server and grabs that user profile and loads it to the local user profile. Now, that computer will look identical to your other computer. When you log off that computer, Windows will save the user profile to the server.
In this way, the profile is always saved to the server and every time you log on it grabs the profile from the server.
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There is another very cool thing that takes too long to write her. But, essentially what you do is start off by making a temporary user profile on the server. It is set up in such a way that any time you make a new user account, it goes to that user account first, so you don't have to make the 50 changes that you normally have to do like change the wall paper and screen saver and setting on the start menu and any and only icon on the desktop. Even the "Display delete confirmation log" on the Recycle bin. In this way, you can set up a new user in minutes rather than an hour.
