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138 Chapter 8 Administering Client Computers
Waking Up a Computer
Apple Remote Desktop can wake up computers that have gone to sleep or been put to
sleep with Remote Desktop. To wake a computer using Remote Desktop, the
computer’s networking hardware must support waking via network packet
(wakeonlan), and the computer must have “Wake For Ethernet Network Administrator
Access” enabled in the Wake Options of Energy Saver preferences.
You cannot wake up computers connected to the network via AirPort or computers not
located on your local subnet. Apple Remote Desktop uses a “wakeonlan” packet to
wake sleeping client computers. The packet can only be delivered by way of a local
broadcast address, so it only works on a local area network. Also, the network hardware
still needs to be powered to receive and act on the packet. AirPort and other wireless
network interfaces completely power down on sleep and therefore can’t receive or act
on a wakeonlan packet.
If you must wake computers on a different subnet, you may want to use a computer on
that subnet as a type of sentry. It never sleeps, and runs another licensed copy of
Remote Desktop, as well as allows itself to be controlled by your local copy of Remote
Desktop. That way you can control the “sentry” computer and instruct it to wake client
computers on its local subnet.
To wake a computer:
1 Select a computer list in the Remote Desktop window.
2 Select one or more computers from the list that show a status as “Sleeping” or offline.
3 Choose Manage > Wake.
4 Click Wake.
Locking a Computer Screen
Apple Remote Desktop can lock a computer screen. When you lock a computer screen,
no one can see the desktop or use the mouse and keyboard on that computer. By
default, Apple Remote Desktop displays a picture of a padlock on locked screens, but
you can display a custom picture. See “Displaying a Custom Picture on a Locked
Screen” on page 139 for more information.
You can continue to work with computers using Remote Desktop after you’ve locked
their screens.