I found an interesting side-effect of the tab of the designer infobox for hotspot buttons. This behavior may be a bug or a feature.
2. Open the button's properties box.
3. Go to the <HTML> tab.
4. Enter "<>" into the "Other" field at the bottom of the tab. See image 1.
5. Save the form.
6. View the form on the Web. The _doClick script will appear right next to the button on the page, with an extra ">" at the end. The result is really no different than using "View Source" to copy the script but it's a little more obvious to bleary eyes!