Probably a really dumb question on such a site, but I received another desk top computer from a friend and was wondering if I could hook it up to my modem with an ethernet cable and get internet connection while still having my main desk top also hooked in. I'm using a Hitronics broadband modem with four ethernet ports. I just want to clean up the friends pc and re-install the OS and a few other programs before giving it to a needy person or someone who could really use it. If I do this, and it is possible, what should I be careful of? I don't want to blow up my own pc, nor do I want to disconnect my own as it is too much aggravation. Thank you in advance for any response and help.