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335.

From the session menu, you can also select \menu{Lock Screen} to require a password before using the computer again \dash this is useful if you need to leave your computer for some duration. You can also use the session menu to set up a guest session for a friend to try Ubuntu, or to \emph{switch users} to log into another user account without closing your applications.

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Ubuntu, just like other operating systems, has a built-in help reference, called the \application{Ubuntu Help Center}. To access it, click on the help icon in the top panel. You can also access it by clicking \menu{Help and Support} in the \menu{System} menu.

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If you can't find an answer to your question in this manual or in the \application{Ubuntu Help Center}, you can contact the Ubuntu community through the Ubuntu Forums (\url{http://ubuntuforums.org}). Many Ubuntu users open an account on the forums to receive help, and in turn provide support to others as they gain more knowledge. Another useful resource is the Ubuntu Wiki (\url{https://wiki.ubuntu.com}), a website maintained by the Ubuntu community.

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A \gls{wireless connection} is when your computer is connected to the Internet via a wireless radio network, also known as Wi-Fi. Laptop computers commonly use Wi-Fi due to their portability, making it easy to access the Internet from different rooms in the house or when traveling. In order to connect to wireless connection, you must have a working wireless network. You will usually need to purchase and install a \emph{wireless router} or \emph{access point}, although some locations will already have a wireless network established.

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\gltodo{``\acronym{DHCP},'' ``\acronym{ISP}''} In order to connect with a wired connection, you need to know whether your network connection supports \gls{DHCP}. This stands for ``Dynamic Host Configuration Protocol,'' and is a way for computers on your network to automatically receive configuration information from your Internet service provider (\gls{ISP}). This is usually the quickest and easiest way of establishing a connection between your computer and your \acronym{ISP} in order to access the Internet, although some \acronym{ISP}s may provide what is called a \emph{static address} instead. If you are unsure whether your \acronym{ISP} supports \acronym{DHCP}, you may wish to contact their customer service line to check. They will also be able to provide you with information on your static address if one has been allocated to you (in many cases \acronym{ISP}s only allocate static addresses to customers upon request).

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If your network supports \acronym{DHCP}, you may already be set up for online access. To check this, click on the NetworkManager icon. There should be a ``Wired Network'' heading in the menu that is displayed. If ``Auto eth$0$'' appears directly underneath, then your computer is currently connected and probably already set up correctly for \acronym{DHCP}. If ``disconnected'' appears in gray underneath the wired network section, look below to see if an option labeled ``Auto eth$0$'' appears in the list. If so, click on it to attempt to establish a wireless connection.

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\marginnote{An Internet Protocol (\acronym{IP}) address is a numerical label assigned to devices on a computer network. It is the equivalent of phone numbers for your house and allows your computer to be uniquely identified so you can access the internet and share files with others.}

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You should see a window showing details about your connection. If your \acronym{IP} address is displayed as 0.0.0.0 or starts with 169.254, then your computer was not successfully provided with an address through \acronym{DHCP}. If it shows another address, it is most likely that your connection was automatically configured correctly. To test out your Internet connection, you may want to open the \application{Firefox} web browser to try loading a web page. More information on using Firefox can be found later in this chapter.

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\marginnote{To access the \window{Connection Information} window, you will need to make sure that networking is enabled. Otherwise this option will be gray and you will not be able to select it through the right-click menu of the NetworkManager applet. To enable networking, right-click on the NetworkManager applet and select \button{Enable Networking} from the popup menu.}

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If you are still not online after following these steps, you may need to try setting up your Internet configuration manually, using a static \acronym{IP} address.