Sharing your desktop over your network called remote desktop sharing this technique not only useful for network profession but it also useful for normal user who wants to share his computer for troubleshoot or any other reason. Normally a network professional use this technique for troubleshooting. I also posted best desktop sharing software if you want to know click here.
In your windows configure
Go to start>> connect to >> show all connection or right click on network icon and go to
properties
Choose local area networking than right click on it go to LAN properties
Scroll down and select by click on TCP/IP and hit properties bottom
click "use the following ip address" and enter your ip address ( but keep it both pc has same class ip address for example 10.0.0.1 is your pc ip and other pc ip is 10.0.0.24 last only last digit you have to change ) then press tab key from your keyboard and finally click on ok bottom to save the change
Then go to my computer right click on it then go my computer properties
Click on Remote bottom select both options that I show in above image and click apply ok
How to connect
Go to start >> all program >> accessories >> remote desktop connection in the computer name just enter other pc ip address and click on ok bottom
Enter other pc password and hit enter now you can control remote desktop
Note you have to disable your firewall, antivirus on both computers
Both pc has same class ip address only last digit change
Use password for safe and secure connection