In Windows, Remote desktop is a Program which makes possible to access desktop of another computer running Windows with your computer over a network or remotely.
For example, if you have two computers, one at home and other at Office, you can access one with other by remote desktop application.

When you install Windows OS, by default ‘Remote Desktop’ is disabled. In order to connect a computer over remote desktop you must enable remote desktop in that computer.
How to enable remote desktop
Step 1: Open ‘Remote Settings’. You can do this with any of the following methods.
- Method 1: Click the ‘Start Button’. Select All Programs. Go to Accessories and select ‘Remote Desktop Connection’
- Method 2: Go to ‘Start’. Right Click on Computer and select properties.
- Method 3: Use short cut, Start + Pause / Break key.

Step 2: Click on ‘Remote Settings’, on the left hand side of the window opened.

Step 3: Then go to ‘Remote’ tab. The following Window will open which will show the current ‘Remote Desktop Settings’.

Step 4: You can see ‘Remote Desktop’ options in the above picture. Click the check button for ‘Allow connections from computers running any version of Remote Desktop’. Then click Apply and OK.
Congratulations, you have enabled remote desktop on your computer.
Note:

If you have set the computer to ‘Hibernation’ or ‘Sleep’ when not using for a specific period of time, then you will see the above message. That means if you are communicating over this computer with remote desktop and it goes to sleeping mode, then you would not be able to access it again until somebody wakes it up. To change it you need to change the settings in ‘Power Option’.
http://goo.gl/FoQ4C
the only problem I see is when you view his logon page, note no doamin on the login, so he is actually in his own house accessing the computer over the wifi through his router. This information is not travelling over the cellular connection or the internet in any way. Actual use of this while not at home where you can walk over to your computer and just use it would be frustratingly slooooowwww!!!!
Dear Wangbu, Thanks for your comment. I would be searching to how to make wi-fi connection faster and would come back with a post.