Henry smiled and followed her in, nodding as she spoke. "Sure." He glanced around, taking in everything that was out in the open and identifying it in his head. It was a nice place, and reminded him of room 302 back home...before all the hauntings, anyway.
"Well, people usually call all that stuff 'computer'. It's a machine, designed to do multiple complex computations, and also to store all different kinds of information. You can access the internet from it." He had to fight the urge to make the joke about the internet being a complex series of tubes. "The box itself is where all the storage and computations actually are. The screen is the monitor, which displays stored information and content you access for you to see. The flat thing is the keyboard, that's what you were using to type out words."
The TV was going to take a little more explaining, but it was as good a place as any to start. He turned and pointed it out. "That box is called a television. It...well, you've seen plays, right? These days, we have devices that can record the plays and then broadcast them through the air. You use your television by turning it to the channel that the play you want to watch is being broadcast on." The explanation was a little simplistic and didn't cover everything, but it was good enough for now. "The smaller box is a DVD player. DVD is another way of recording plays, though these are usually longer than the ones you see on television. They're little circular discs, and you put the disc containing the play you want to watch into the DVD player."
Then he turned to the stereo. "That's called a stereo. The same way television programs are broadcast, music is broadcast, and stereos can tune in to the right channel to hear the music being broadcast." Then he gestured to the entertainment center. "That's called an entertainment center, and it's used to keep your television, DVD player, and DVDs in one place. That way you don't have to look for it, it's all in one place."
He turned back to her and smiled again. "Let me know if you want me to go over any of that again, okay? I know it's a lot to digest."