Go back to 9L0-415 - OS X Support Essentials 10.9

Question :-

The Messages application allows for on-demand screen sharing that can be used even when the system screen sharing service isn't enabled.
What options can you select from during the OS X Mavericks installation?
Which application can provide on-demand screen sharing even when the Screen Sharing service isn't enabled?
What application is used to manage keychain settings?
Which optional firewall settings are available?

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