JTAG is a hardware interface used for providing all sorts of "debug" and "test" functionality for circuit boards and chips. Precisely what can be done using JTAG varies greatly, but the microcontroller in the NXT allows JTAG to read and modify all of the CPU's state for debugging. This can be used to read back data stored inside the chip.
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，这一点在新收录的资料中也有详细论述
NoOpEmailSender: selected automatically when email is disabled.。关于这个话题，新收录的资料提供了深入分析
Overall, however, what Apple has done to Pages over this period of time is representative of a broader trend of minimizing the delineation of user interface elements from each other and the document itself. This is the only tool in the toolbox, and I am skeptical it achieves what Apple intends.