What is an xbox jtag mod thing?

i hear my friends talking all the time about jtag modern warfare 2 mods, but none would explain what they are. i tried looking it up, but they dont really tell much about them (at least for the xbox purpose most are for other uses). the best expanation i have concluded from all the bits and pieces of information... show more i hear my friends talking all the time about jtag modern warfare 2 mods, but none would explain what they are. i tried looking it up, but they dont really tell much about them (at least for the xbox purpose most are for other uses). the best expanation i have concluded from all the bits and pieces of information about them overheard in friends parties is a device that hooks up to your xbox maybe ethernet or usb and goes to your laptop? and it lets you load a mod already patched in the game after the match starts and alows it to bypass the patch. any better easy to understand explanation and the pricing range of these? thanx ahead of time
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