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Click the Time Limits tab (see Figure 8-5), and then set time limits:

Log in Snow Leopard Server Open directory master server Macs Primary domain controller (PDC) handles login for Windows clients

and the Weekend check box, and then use the boxes to specify the times when the user may not use the Mac

Snow Leopard Server Open Directory replica server Windows PCs a u Bck domain contr p oller (B C) D handles login for Windows clients if primary domain controller (PDC) is uavailab n le

9 10

Click the lock icon to secure the changes you ve made Open the System Preferences menu and click Quit System Preferences to close System Preferences

Figure 5-2 By setting up your master server as a primary domain controller and another server as a backup domain controller, you can enable Windows PCs to log into the network easily

Figure 8-5: The Time Limits controls let you restrict a user s total time on the Mac and prevent them from using it when they should be asleep

When you log in to the network, Open Directory authenticates you: It verifies that the password you provide matches the user name Assuming it does, Open Directory considers that it has established your identity satisfactorily NOTE Open Directory doesn t really establish your identity, as you could have shared your user name and password with anyone under the sun Open Directory s authentication is more like an ATM checking that the PIN you provide matches the bank card you slide in than the Highway Patrol checking that your face matches the photo on your driver s license But let s leave this nicety aside One day, networks will establish our identity up to the eyeballs perhaps by using them After authenticating you, Open Directory checks what you are authorized to do: for example, access this server, but not that one; reserve a projector, but not a conference room; or add comments to one wiki, but not scribble insults on another

168 168

Mac OS X makes the Parental Controls as set-and-forget as possible, but to monitor the managed users effectively you should periodically view the lists of web sites the users have visited (or tried to visit), the applications they ve tried to use, and the contacts they ve been chatting with To do so, you use the Logs tab of the Parental Controls sheet:

There are various different standards for directory services on networks Open Directory can access the following five widely used standards: Lightweight Directory Access Protocol (LDAP) LDAP is an open standard used in networks that include different operating systems (such as Mac OS X, Windows, and UNIX computers) Mac OS X Server uses LDAP as its native directory service for shared directories Active Directory Active Directory (sometimes abbreviated to AD, but often not to avoid confusion) is the directory service used by Microsoft s Windows Server networks Network Information System (NIS) NIS is the directory service used by most varieties of UNIX BSD flat files These files are used by the Berkeley Software Distribution of UNIX to contain directory information ( Flat means that the files are more like spreadsheets than the relational database tables used by other directories) Open Directory also accesses directory domains in the Local Directory Domain format This is the format that Mac OS X and Mac OS X Server use for storing local directory information

Open the menu, click System Preferences, and then click Parental Controls to open the Parental Controls pane

5:

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hall we continue I didn t want to overwhelm Sid Sure, he replied But remember I have a staff meeting at 10

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