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170 Chapter 9 Managing Preferences
2 Optionally set the key “MCXScriptTrust” in ~root/Library/Preferences/
com.apple.loginwidow.plist to a valid TRUST string.
$ sudo defaults write com.apple.loginwindow.plist MCXScriptTrust -
string PartialTrust
If this is not set it becomes an invalid TRUST string. The trust level of “FullTrust” is
needed to execute any available scripts set up in the Scripts pane in Login System
Preferences above.
The valid TRUST strings in relative trust order are Anonymous, “DHCP”, “Encryption”,
Authenticated”, “PartialTrust”, “FullTrust. Specifying a TRUST string also allows any trust
value above that TRUST string. Thus Anonymous allows all trust levels; “PartialTrust
allows “PartialTrust and “Full Trust”. Note that most Active Directory nodes will support
“PartialTrust” and not “FullTrust.
After you have accomplished the previous two steps you would add the login or logout
script using Workgroup Manager to the computer list of choice. Note that the script
can’t be more than 30 kb in size.
Managing Media Access Preferences
Media Access preferences let you control settings for and access to CDs, DVDs, the local
hard drive, and external disks (for example, floppy disks and FireWire drives). The table
below describes what you can do with the settings on each Media Access pane.
Controlling Access to CDs, DVDs, and Recordable Discs
If a computer can play or record CDs or DVDs, you can control whether users can
access items (music, movies, and so on) on these discs. You cannot permit access to
only certain discs or to specific items on a disc.
If a computer has the appropriate hardware, you can control whether users can “burn
discs”: write information to a recordable disc such as a CD-R, CD-RW, or DVD-R. Users
can burn CDs on computers with a CD-RW drive, Combo Drive, or SuperDrive. Users
can burn DVDs only on computers with a SuperDrive.
To control access to disc media:
1 In Workgroup Manager, click Preferences.
2 Make sure the right directory is selected and that you are authenticated for it.
Media Access preference pane What you can control
Disc Media Settings for CDs, DVDs, and recordable discs (for example, a CD-R,
CD-RW, or DVD-R). Computers without appropriate hardware to use
CDs, DVDs, or recordable discs are not affected by these settings.
Other Media Internal hard disks and external disks other than CDs or DVDs
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