Information Technology Reference
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5.10 Click the document you want to download, and then click the format you want to use.
Accessing MacBook Air over the Internet
Having a few important documents stored in iCloud can bail you out of a jam if you forget one of those files
when you leave the house or office. Of course, a variation on Murphy's Law states that whatever file you need
when you're away from MacBook Air will be a file that you didn't upload to iCloud.
Besides missing a particular file, another problem you may run into when you're on the road is missing a partic-
ular application. For example, suppose you have Microsoft Word on your home or office iMac but not on your
MacBook Air. If you need to create a Word document or check a Word setting while you're using MacBook Air
away from your home or office, you're out of luck.
You can solve both types of problems by accessing MacBook Air from a remote location using iCloud's Back to
My Mac application. For this to work, you need to set up your two Macs as follows:
A local Mac that's running OS X Mountain Lion (10.8), OS X Lion (10.7), or later with a broadband connec-
tion to the Internet and signed in to an iCloud account.
A remote Mac that's running OS X Mountain Lion (10.8), OS X Lion (10.7), or later with a broadband con-
nection to the Internet and signed in to the same iCloud account as the local Mac. In the rest of this section, I as-
sume that this remote Mac is your MacBook Air.
Your local Mac also needs to connect to the network using a router that supports Universal Plug and Play (UPnP).
Most modern routers support UPnP, so this shouldn't be a problem, but check your router manual to see how to en-
sure that UPnP is enabled.
If you have two such Macs, you're good to go. You can use the iCloud Back to My Mac feature, which enables
you to use the remote Mac to connect to the local Mac via the iCloud account that they have in common. To
configure Back to My Mac, you need to follow these steps on both Macs:
1. Pull down the Apple menu and choose System Preferences. The System Preferences window appears.
2. Click iCloud.
3. Select the Back to My Mac check box, as shown in Figure 5.11.
The rest of the steps you only need to perform on the local Mac:
1. Click Open Sharing Preferences. The Sharing dialog appears.
2. Select the Screen Sharing check box. Screen sharing enables you to control the local Mac as though
you were sitting in front of it.
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