Ah, one of my favorite tool to manage my network.
As a network administrator for 30 or so clients, I need to make sure I'm able to maintain all of my clients. Typically, I used old fashioned 'door to door' approach whenever my clients need me. However my time was too much consumed on walking to destination, since the clients are scattered all over of this building (2 floors). The usual requests were questions about why certain things aren't working as before e.g 'My internet conn is broken!' 'I can't save my word file.'. These can be done from one spot, if I could remote their computers.
A quick Google search linked me to VNC website. That site offered two kind of remote softwares, both under one brand, VNC. The commercial version has several advantages but eh, I don't give a damn to pay for a software so I sort it out and made my way to free version download page.
You need to install it on both computers. Make sure you disable any firewalls active or open specific ports (5800 and 5900) on remote computer. Once VNC is up and running on remote computer, you can control it anytime from your computer. To connect, just type destination computer's name on VNC viewer and press ok. Typically, you don't need to modify anything except passwords on remote computer. The initial configurations are all done automatically by its installer.
And there's no need for me to walk around just to solve small matters now! :D