150 CHAPTER 10 (Simple web server) PERSONALIZING UBUNTU: GETTING EVERYTHING
150 CHAPTER 10 PERSONALIZING UBUNTU: GETTING EVERYTHING JUST RIGHT Users: Here, you can specify which users are offered as choices within GDM if the Face Browser option is activated in the Security tab. Bear in mind that Linux has many system user accounts that aren t designed to allow logins. By default, all users who have a password are displayed, which is the best way of working (the system accounts don t have passwords because they aren t login accounts). SETTING UP ASSISTIVE TECHNOLOGY SUPPORT You might know about the Accessibility tools under Windows, which help people with special needs use the computer. It s possible to use an on-screen magnifier so that users can better see what they re typing or reading, for example. Under the GNOME desktop, the Accessibility tools are referred to as Assistive Technology Support. To use them, you need to install additional software packages, and then enable them. Follow these steps: 1. Assuming the Synaptic Package Manager is set up to use the online repositories (see Chapter 
, open the program (System . Administration . Synaptic Package Manager). 2. Click the Search button and enter gok as a search term. In the list of results, click the check box alongside the gok entry, and then click Mark for Installation. 3. Click the Search button again and search for gnopernicus. Again, mark its entry for installation. Then click Apply. 4. Once the packages are installed, select System . Administration . Preferences . Assistive Technology Support. Click the check box alongside Enable Assistive Technologies. 5. Choose from the list the features you would like to use. They will then start automatically the next time you log in. The options work as follows: The Screenreader uses a speech synthesizer to announce whatever you click on, as well as whatever you type. To alter its settings, click the Preferences button in the Gnopernicus dialog box, and then click the Speech button in the Preferences dialog box. The GNOME Onscreen Keyboard (GOK) can be used by a mouse, but is most useful when an alternative input device is used, such as a touch screen. As well as presenting a virtual keyboard, it shows the options on screen as a large and easy-to-activate series of buttons. For more information, click the Help button when GOK starts. The Magnifier divides the screen into two halves. The right side displays a magnified version of the left side. To learn more, click the Help button in the Gnopernicus dialog box. Gnopernicus also includes support for Braille output devices. To learn more, click the Help button.