How can i find out the class name of a text box within internet explorer?

I am following a tutorial and this is the step i am having problems with:

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lpsz1 refers to the classname of the current window you are trying to find. So in our example (notepad), the textbox that I am typing in right now is called "Edit". 90% of the textboxes you see are "Edit", yet rich textboxes are not "Edit" There is no need to sweat class names because an API SPY gets them for you!
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The API SPY program that i got down will not identify the class name of a text box within Internet Explorer.

Any ideas would be great.

thanks.