How do I underline the words "while" I'm typing on a PC keyboard?

I am a reasonably good typist, and learned on manual typewriters, but since I've been using PC keyboards that's one thing I've never figured out how to do. And, that is; how do you underline your words while you're typing them? You cannot do it later, like in a standard typewriter, and I see no... show more I am a reasonably good typist, and learned on manual typewriters, but since I've been using PC keyboards that's one thing I've never figured out how to do. And, that is; how do you underline your words while you're typing them? You cannot do it later, like in a standard typewriter, and I see no way of doing it "as" you type. So how??
Thanks.
Update: I'm afraid the first 3 answers do NOT work. I need to do it when I'm typing an email or info on a website.
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