See msn chat on another PC on network

Is there any software that will allow me to see someone's msn chat messages on another pc in the house. I am concerned about the behaviour of someone staying in the house (not a family member) but do not want to say anything until I am sure. I know I can save chat messages but wondered if I can see other pc's on network somehow. This sounds awful reading it but it is concern that is behind it not just a being nosey
Thanks for any help.

 

TeamViewer can do this, but it would need to be installed on the machine you want to view, and preconfigured to autostart and accept your password in order to initiate a session. It can be used simply to view another machine or to take control of it. However if the other person is at all technically minded then the likelihood is that your actions would quickly be detected.

 

You should talk to a lawyer before you try anything.

 

Oh its for good intentions? Go ahead and spy one someone thats a good way to show concern. Seriously tho, talk to a person, dont spy on em. Theres no reason and all it will do is make said person not trust you.