Your Mac contains thousands of hidden files and folders that you'll probably never need to access. We explained how to access all hidden files and folders in another tutorial, but there's an easier way to access one of most important hidden folders on your Mac, called the Library folder.
When your Mac is connected to a private network in a home or office, it's probably assigned what's known as a dynamic IP address. (To check, see How to Find Your Mac's IP Address.) That's not a problem for the majority of users - most people don't care whether their IP addresses changes or not. But dynamic IP addresses won't work for certain tasks like port forwarding, dynamic DNS, or client-to-client file sharing on the local network. For those unique situations and others, only a static IP address will work.
Your Mac allows you to save and quickly switch between multiple network configurations, which are referred to as network locations in OS X. This is a useful feature for users who need to set network-specific proxies, DNS servers, or static IP addresses. You can also use network locations to specify settings for specific network interfaces, such as an Ethernet card, Wi-Fi or Bluetooth connection, and even VPN.
AirPort base stations released after 2009 are capable of operating over both 2.4GHz and 5GHz bands simultaneously. That means that when you connect a Mac, iPhone, or iPad to an AirPort's wireless network, it will automatically select and use one of the bands for the best speed, consistency, and range.
Your iPhone is assigned something called an IP address when it connects to a Wi-Fi network. Other devices that are connected to the same Wi-Fi network can use this unique identifier to transfer information to and from your iPhone. If this sounds confusing, it might help to think of an IP address as your iPhone's home mailing address. Just like physical mail, which is routed to your home via a unique address, digital information is routed to your iPhone using an IP address.
There may be certain situations when you'll need to find your iPhone's IP address. Here's how to find it:
Your Mac is assigned something called an IP address when it connects to a network. Other devices that are connected to the same network can use this unique identifier to transfer information to and from your Mac. If this sounds confusing, it might help to think of an IP address as your Mac's home mailing address. Just like physical mail, which is routed to your home via a unique address, digital information is routed to your Mac using an IP address.
There may be certain situations when you'll need to find your Mac's IP address. Here's how to find it:
Whether you operate a guest network on your AirPort or simply use it to provide wireless access to the people in your home or workplace, you should ensure that your AirPort base station's settings are protected with a strong password. Doing so will prevent users connected to the AirPort network from modifying the base station's settings with the AirPort Utility application. The base station's password is usually specified when setting up the AirPort, but it can be changed at any time.
Need a way to capture your Mac's entire screen or only a portion of it? Take a screenshot - a picture of your Mac's screen that includes the windows and applications that are currently visible. You can take screenshots when creating documentation, explaining system settings to friends or family members, or just capturing something on your screen that you want to share with others. This tutorial shows you how.
Capturing the Entire Screen
Taking a screenshot of your iPad allows you to capture whatever is on your iPad's screen. It's a great way to share your high game scores, message conversations, or setting configurations. Screenshots are saved as photos on your iPad, and if you use Photo Stream, they're automatically shared with all of your other Apple devices. An example screenshot is shown below.
Here's how to take a screenshot of your iPad:
Did you know that your AirPort base station is capable of creating two separate wi-fi networks? By enabling the guest network feature, you can create a second network specifically for guests or - since guest wi-fi networks can be open or protected with a password - authorized users. Creating a guest wi-fi network with your AirPort is easy and takes only a few minutes. This tutorial shows you how to do it.