What are the two speakers talking about?

Woman: So this is the Internet?
Man: Well, it’s the World Wide Web, which is part of the Internet,
W: Wow ... and, uh, what do you use it for?
M: Oh, well, (4[C])I can sit here in my office and do almost anything.
W: Well, like what?
M: Well, this morning, the first thing I did when I got up was to turn on the computer. In a couple of minutes, I was reading the newspaper from Chicago.
W: Wow.
M: Yeah, you can read hundreds of newspapers from around the world.
W: That’s amazing.
M: That’s just the start. Then I checked my e-mail. There was a message from my dad in Chicago, one from my sister in San Francisco, and a message from my brother in Hong Kong. (5[A])My dad’s message was to tell me not to forget my mom’s birthday. So I sent her an electronic birthday card.
W: An electronic birthday card?
M: Uh-huh.
W: Fantastic.
M: (6[D])My sister wanted to know if I was planning to visit her in San Francisco during my vacation,
W: So., are you?
M: Well, I checked an airline reservation service. I looked at the schedule and picked a flight, booked it, and sent the information to my sister. After about an hour she sent me a reply saying she’d pick me up at the airport.
W: No way! You can see video images through your computer?
M: Absolutely, Sure. Amazing, isn’t it?