JTAG is a method for inspecting IC chips and debugging programs. Specifications are standardized and many IC chips support JTAG. Due to these factors, a JTAG environment makes it possible to inspect and debug many IC chips.
Further details are beyond the scope of this FAQ but there is a large amount of information on JTAG available on the Internet and in other places.
Applicable versions: 01.00.00, 002, and 003