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The question was referring to the wheel which is used for scrolling, but as indicated in the Microsoft catalog it also lets you "Zoom quickly" in or out by holding the CTRL key while rolling the wheel (in compatible applications).
So the real question is when you use it with a web browser, which presumably is a compatible application, does it work on some web pages and not on others.
During the meeting we picked a web page where it did work, saved it to the hard disk, and displayed it with a browser from the HD. The ctrl-wheel still worked. We then went through the page eliminating one block of javascript or block of other html code after the other, testing it each time, hoping to identify which block of code allowed the text size to increase when operating the wheel with the ctrl key down.
This is a good technique for learning how an unfamiliar piece of html code works. In fact it is how I first learned HTML, through a technique I called "Web Page Programming Through Plagarism" in which I would find a site that did something I liked, I would save it to my HD, and replace all of the words outside of the html tags, identified as being between a "<" and a ">", with my own text, but leaving the html tags intact, thus creating my own page which resembled the borrowed page, and then making selective changes within the html tags to see what those changes did to how the page appeared when viewed by a browser.
Only it did not work in this case, so I told the students I would experiment with it myself and see if I could come up with something for the April 4 class, and than until then it was an exercise for the student to figure out.
Well I think I have figured it out. It appears that it works on web pages which DO NOT use CSS (Cascading Stlye Sheets). There must be something about Cascading Style Sheets that blocks the effect of the driver for the intellimouse.
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