Help remoting into a Windows computer

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http://ubuntuforums.org – I'm running Ubuntu 12.04 LTS on my laptop and would like to be able to remote into a Windows 8 computer desktop so that I have full access to the PC, but the person sitting in front of the Windows 8 pc can also use the mouse and keyboard (Desktop sharing) I've forgotten what the name of the program to install on my Ubuntu pc is called. I know you can do this with Team Viewer, but I would like to stay away from this app. Could someone assist? Thank you (Hardware)