My DSL internet subscription is with PLDT and with it comes a black box. It is connected to my main PC. Now I just recently bought a netbook. My questions are:

1. What do you call that black box?
2. Can this be purchased from a PC store? I want to have a second one, if in case the one I have will die on me.
3. Can I install a router (like a PCI card) on my PC to recognize my netbook, if I want to have a wireless connection on my netbook? Is there such a PCI card-router?
4. I have seen such PCI card with an antenna, is this a router?

BTW, I'm not an IT person .... I just know how to install, especially when required to click "next," "Next,".......