The applet http://www.falstad.com/dotproduct/ can be used offline. I checked it to make sure.
You will need to download dotproduct.jar
(the link on the page — are you familiar with “View Source”?) To the local file system, then create HTML (or use a copy of Paul Falstad’s own HTML code) to run it.
You can try "Save Page As" for part 2 nd but I'm not sure if it also loaded the Jar of the applet itself.
Of course, it would be polite to tell Paul what you are doing. You may find that he will be ready to send you a Zip HTML / applet.
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