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Figure 4-11 shows the dialog box that appears when you double-click a dial-up connection in the Network Connections window. Although this connection window is simple, it is important to note that you can change your user name and password if necessary, and you can also make the connection private or public in terms of local user access. Figure 4-11 shows that this connection is available to all users who access this particular computer. If you select Me Only, the connection s user name and password will be saved and made available only when the designated user is signed on to Windows XP. Other users signing on to the computer and attempting to use the connection will each have to provide a valid user name and password. If they don t know the designated user s account information and don t have their own account, they won t be able to use the connection. However, if the designated user signs on to the computer and then leaves it unattended, anyone can sit down at the computer and access the connection. Additionally, when Me Only is selected and the user either logs off the computer or uses Fast User Switching to switch to another user, the dial-up session will automatically be disconnected.

Having duplicate data makes updates and deletions more problematic and also poses the risk of having modified data in one table and not the other This example demonstrates a data integrity problem Let s look at another data integrity problem Suppose you have both a product table and a table containing customer order details Now let s say you decide to delete product1, which means removing the row from the product table that corresponds to product1 If the RDBMS would let you do this, it would mean that suddenly all rows in the customer order details table that contained this product would not be able to show which product was ordered because the product would no longer exist Those rows would be orphaned, which could have disastrous results for the company Although you normalized your data, data integrity does not exist in this example.

Plug in your Plug and Play modem or USB modem. In Control Panel, use Phone and Modem Options. In Control Panel, add a modem by using Add Hardware.

In each of these cases, the Add Hardware Wizard appears and asks whether you want Windows XP Professional to automatically detect the modem or whether you want to manually

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Another option is to clear the check box labeled Save This User Name And Password For The Following Users, which deactivates both of the suboptions. With this option, even the designated user will have to supply the user name and password each time a connection is desired. This way an unattended machine can t be used by an unauthorized person to access the Internet. As with selecting Me Only, using Fast User Switching or logging off will result in dial-up sessions being disconnected. You can configure additional properties of a dial-up connection by right-clicking the connection in Network Connections and choosing Properties. Note that you can also delete a connection, make it the default, or connect or disconnect by right-clicking the connection. If you access the connection s properties, you see several different tabs that you can use to further configure the Internet connection. A number of the options on the tabs are self-explanatory, but the most important configuration options are discussed next.

select a modem from the list of known manufacturers and modem models. If you choose the detection option, the wizard detects and then queries the modem to configure it. If it cannot detect the modem, it prompts you to select one. After the modem is selected, you can, if necessary, adjust its properties, such as the volume for the modem speaker, the time to wait for the remote computer to answer the call, and the maximum data transmission speed. These adjustments are made by using Phone and Modem Options in Control Panel. Depending on the type of modem you have, installing and configuring it might vary slightly as follows: