I learned about them from the great folks on this forum. Without it, I couldn't do any of the things I think are pretty slick. Really, everything that I think is pretty amazing, was learned from reading, searching, and asking on this forum. Aside from the 222 page PicBasicPro manual, the forum is the most centralized resource that you will find.
I would agree with Alain, after reading the PBP manual and it's examples, the next best resource of examples is www.parallax.com site will have the best examples of basic. I have a Pic Basic Pro book that I hate, and I have browsed a few others that I dislike equally. Most are using examples of PIC16C devices and such that are older than my dog, and don't talk much on timers, interrupts, etc. I say save your money, and get the free examples that Parallax has in their documentation, and use this forum. Also read your manual from cover to cover two or three times. It will start to sink in, as you use the commands.
You can learn more about the DT_INTS by searching the forum. Besides Darrel's page, this is the only other source for information on how to use his interrupts.
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