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      Never take that dialog box lightly. If you click Don't Save/No, any changes you have made in the app will be lost. Your options are as follows:

      Using the Notification Area

      Over on the right side of the taskbar is the notification area (also called the system tray or tray). Each icon in the notification area represents a program or service that's running in the background. For example, antivirus and antispyware programs often show icons in the notification area so that you know they're running.

      To conserve space on the taskbar, Windows 10 gives you the option of hiding inactive icons. When inactive icons are hidden, you see a button with up and down arrows on it at the left side of the notification area. Click the button to see icons that are currently hidden.

      As with any icon or button, you can point to an icon in the notification area to see the name of that icon. Right-clicking an icon usually provides a context menu of options for using the item. Clicking or double-clicking the icon usually opens a program window that's associated with the running background service.

For example, the Volume icon provides a simple service: It lets you control the volume of your speakers. To change the volume, you click the icon and then drag the slider (shown in Figure 3.18) up or down. Optionally, you can mute the speakers by choosing the button at the bottom of the slider. Click it again to remove the mute. The Mixer option opens a window in which you can control the volume of different kinds of sounds independently.

Figure 3.18 The volume control slider.

      The icons in the notification area don't represent programs that you can run. They represent programs that are running. The icon simply serves as a notification that the program is running, although in most cases, the icon also provides options for closing the program or changing how it runs. Different computers have different notification area icons. The following are some common examples:

      ● Network Connections: You might see an icon that lets you disconnect from the network, view and connect to wireless networks, and open the Network and Sharing Center.

      ● Security programs: Programs that protect your system from malware (such as viruses and spyware) often display icons in the notification area.

      ● Power: An icon indicates the charging status and battery capacity of your mobile device.

      Windows 10 includes a selection of system icons that can appear in the notification area. These include Clock, Volume, Network, Power, Input Indicator, and Action Center. Other icons can also appear in the notification area. The following section explains how to turn on or off these icons.

Showing/hiding system and notification icons

You can choose for yourself which notification area icons you do and don't want to see at any time. You rarely need to see them all, so you can hide some if you prefer. To make choices about those icons, right-click the clock or blank area of the tray and choose Customize Notification Icons. The Notifications and Actions page of the Settings app, shown in Figure 3.19, opens.

Figure 3.19 The Notifications and Actions page.

      The Notifications and Actions page provides options for controlling the types of notifications that appear and when and where they appear. Click the link Select Which Icons Appear on the Taskbar to choose which icons you want displayed. Click the link Turn System Icons On or Off to show or hide specific system icons from the tray.

      Chapter 10 discusses additional techniques for customizing the desktop, taskbar, and notification area.

Responding to notification messages

      Icons in the notification area may occasionally display messages in a speech balloon. Many messages just provide some feedback and don't require any response from you. These messages generally fade away on their own after a few seconds. But you can also close the message by clicking the Close (X) button in its upper-right corner.

Using scroll bars

Scroll bars appear in program windows whenever the window contains more information than it can fit. You may not see any on your screen right now. But don't worry about that. The trick is to recognize them when you do see them, to know what they mean, and to know how to work them. Figure 3.20 shows an example of a vertical scroll bar and a horizontal scroll bar.

Figure 3.20 Examples of scroll bars.

      When you see a scroll bar, it means that there's more to see than what's currently visible in the window. The size of the scroll box (the bit inside the scroll bar area that looks like a long button) relative to the size of the scroll bar tells you roughly how much more there is to see. For example, if the scroll bar is about 10 percent the size of the bar, it means you're seeing only about 10 percent of all there is to see.

      To see the rest, you use the scroll bar to scroll through the information. You have basically three ways to use scroll bars:

      ● Click a button at the end of the scroll bar to move a little bit in the direction of the arrow on the button.

      ● Click an empty space on the scroll bar to move the scroll box along the bar toward the place where you clicked. That moves you farther than clicking the buttons would.

      ● Drag the scroll box in the direction you want to scroll. To drag, place the mouse pointer on the button and hold down the left mouse

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