Apple's Tiger: the most impenetrable Mac system yet
Tiger is the most impenetrable Mac system yet, filled with new defenses against the dark arts. Messages alert you -- a little annoyingly, actually -- every time you download a file that could theoretically contain a virus (because it contains a runnable program, even if it's compressed).
And a new "stealth mode" in Tiger's built-in firewall makes your Mac invisible to ping signals from Internet predators hunting for computers to infect.
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