USB : How "Universal" is it??

[Zekester2097]

Ok, this just came to me a while ago. I'm thinking about USB, more particularly, the baggie of USB dongles I bring with me when I take my laptop downstairs, to use the living room table as a temporary PC desk. I was thinking about how everything in it is mostly USB flash drives, EXCEPT for my NETGEAR WNA1100 N150 Wi-Fi receiver, which runs solely from USB. Then that got me thinking, couldn't I make an old PC that has no soft drives, or no Wi-Fi card, into a full PC?? The thing is, I have alot of USB stuff, like a DVD drive (runs solely from USB), a Wi-Fi card, a mouse, keyboard, micro SD card adapters, etc. The thing is, USB is an acronym, which means "Universal Serial Bus". I understand why they call it "universal", as you can do almost anything with 1 USB connector (I have a USB hub to increase the amount, if that's the case). So really, what CAN'T you do with USB??

PS. if your OS is compatible, you can even connect ur PC to a modem with USB...