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Sends packets without waiting for a reply. If used with the -f option, this may cause a denial-of-service attack on the target host and the host may stop functioning properly or even crash. Apart from the unknown harm that this may do to the target server, you may find yourself blacklisted or even charged with a criminal offense. Because this is such a very dangerous option, only the user root is allowed to use it. Sets the time to live (TTL) for packets that are sent. This indicates the maximum number of routers that each packet may pass through on its way to a destination. The TTL is decremented by one by each router it passes until the TTL becomes 0, which means that the packet won t be routed any more. Sends packets to the broadcast address of the network. This prompts a reply from every host that s up and allowed to answer to ping packets.

On the General tab of the Mouse Preferences dialog box, shown in Figure 7-2, you can configure several options.

Figure 7-2. The Mouse Preferences dialog box lets you tame that mouse. These options are as follows: Mouse Orientation: This option lets you set whether the mouse is to be used by a left-handed or right-handed person. Effectively, it swaps the functions of the right and left buttons. Locate Pointer: This option allows you to show where the mouse is by displaying a ripple surrounding the mouse pointer when you press the Ctrl key. This can be useful for partially sighted people who may not be able to locate the cursor on a busy Desktop. Acceleration: This setting controls how fast the mouse pointer moves. Whenever you move the mouse, the pointer on the screen moves a corresponding amount. However, the cursor actually increases in speed the more you move your hand (otherwise, you would need to drag your hand across the desk to get from one side of the screen to the other). This is referred to as acceleration. If you set the acceleration too high, the pointer will fly around the screen, seemingly unable to stop. If you set it too slow, you ll need to swipe the mouse several times to make it go anywhere. Sensitivity: This setting controls how quickly the acceleration kicks in when you first move the mouse. Choosing a higher setting means that you can move the

Note To protect against a denial-of-service attack, many hosts are configured not to answer a ping

We can include the fields we are grouping by in the SELECT clause so we can see which counts belong to which entries. This is shown in Listing 8-18, and the output is shown in Figure 8-4.

mouse relatively quickly before it starts to accelerate and cover more screen space. A low setting means that acceleration will begin almost as soon as you move the mouse. Higher sensitivity settings give you more control over the mouse, which can be useful if you use image-editing programs, for example. Drag and Drop: This setting determines the amount of mouse movement allowed in a dragging maneuver before the item under the cursor is moved. It is designed for people who have limited dexterity and who might be unable to keep the mouse perfectly still when selecting an item. In such cases, a large threshold value may be preferred. Double-Click Timeout: This is ideal for those who are less physically dexterous, because the double-click speed can be slowed down. On the other hand, if you find yourself accidentally double-clicking items, you can speed it up. Test your settings by double-clicking the lightbulb image. Changes are made as each setting is adjusted, so to test the new settings, simply move your mouse.

request. Therefore, when testing connectivity, make sure that you use a host that s allowed to answer.

The settings on the Accessibility tab can help people with physical disabilities use the mouse. However, to enable these features, you need to enable Assistive Technologies in Ubuntu first, as follows: 1. 2. 3. 4. Open the Assistive Technologies Preferences dialog box (System Preferences Assistive Technologies). Select the Enable Assistive Technologies check box and then click the Close and Log Out button (this is necessary to start the background services). Select Log Out in the Shutdown dialog box, and then log back in again when prompted. After logging in, return to the Accessibility tab of the Mouse Preferences dialog box (System Preferences Mouse).

Listing 8-18. Include the MemberID (the Grouping Field) in the Output SELECT MemberID, COUNT(*) AS NumEntries FROM Entry GROUP BY MemberID