Do I have to keep Itunes up and running on my PC to view media stored on my pc? Or does it run in the back ground

I currently have a PC with a Few movies on them that are in my Itunes. Do I need to keep Itunes up and running on my PC to view them or does it do the sharing in the back ground. Also I am looking at getting a ext HD that would be connected to my home network. Do I need to link all of that media with Itunes or will it communicate with the HD on it;s own?

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