Mac Integration Basics v10.7 - Apple

Reset a firmware password:
To reset a lost or forgotten firmware password, you’ll need access to the inside of the
Mac (just like resetting a PC BIOS password requires removing the on-board battery).
1. Shut down the Mac.
2. Change the memory configuration by adding or removing RAM.
3. Start up the Mac.
This will clear the firmware password.
4. Shut the Mac down again.
5. Return the RAM to its original configuration.
6. Start up the Mac.
Note: For information on recovering a lost firmware password on later model
computers, such as the MacBook Air (Late 2010), the MacBook Pro (Early 2011), and the
iMac (Mid 2011), refer to http://support.apple.com/kb/TS3554.
Antivirus Protection
With virtually no effort on your part, OS X offers a multilayered system of defenses
against viruses and other malicious applications, or malware. For example, it prevents
hackers from harming your programs through a technique called “sandboxing”—
restricting what actions programs can perform on your Mac, what files they can
access, and what other programs they can launch. Other automatic security features
include Library Randomization, which prevents malicious commands from finding
their targets, and Execute Disable, which protects the memory in your Mac from
attacks.
Viruses are uncommon in OS X, but it’s good policy to remain vigilant, especially when
exchanging files with computers using other operating systems. Regular use of
commercial antivirus software such as Norton Antivirus or Intego VirusBarrier can help
prevent forwarding of viruses.
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