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My experience is that if the system is custom or a business unit, the service tag tends to be accurate. The mass-market versions where parts are multi-sourced tend not to be. Networking, especially wireless, is where I've seen the service tag/express code become useless or even wrong.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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