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If the modem supports Plug and Play, make sure it is configured to respond as a Plug and Play device, rather than manually configured for resource settings. This is normally accomplished by using a configuration application provided with the modem. If you install a modem that does not support Plug and Play, you must configure its builtin COM port by using the Add Hardware Wizard before it is installed by using Phone and Modem Options in Control Panel. In most cases, the Add Hardware Wizard does this automatically for you. If you are using Personal Computer Memory Card International Association (PCMCIA) drivers with Windows XP Professional, Windows XP Professional detects and configures PCMCIA modems automatically when they are first inserted. If you are using a USB modem, it is automatically detected when installed.

This procedure is for both internal and external modems. PCMCIA and USB modems automatically install when inserted. Before you install a modem, see Modems in Windows XP Professional Readme.txt.

4

To install a modem by using Phone and Modem Options 1. In Control Panel, open Phone and Modem Options. 2. Select the Modems tab, as shown in Figure 26-4, and then click Add to start the Add Hardware Wizard. The Add Hardware Wizard leads you through the steps for installing a modem. In most cases, let the Add Hardware Wizard detect the modem for you. If it cannot detect the exact manufacturer and model, the wizard picks a standard configuration that is usually compatible; your modem still functions at its maximum speed and according to factory default settings. A few advanced features such as enabling and disabling compression, error control, and flow control might be disabled.

Part IV:

Figure 26-4

If you select Anyone Who Uses This Computer, any user on the computer will be able to use that dial-up connection. If a user initiates a dial-up session and then logs off, Windows XP will prompt the user to determine if that user wants to disconnect the dial-up session or leave it running. If the first user leaves it running and another user subsequently logs on, and then does not disconnect the session manually when logging off, the session will be maintained and that user (and all subsequent users) will not be prompted. If, on the other hand, Fast User Switching is used to switch users, the connection is automatically maintained.

For information about installing a modem or about finding a better match than a standard modem type, see Troubleshooting Modems later in this chapter. Windows XP Professional automatically makes COM port assignments to communications ports, internal modem adapters, and PCMCIA modems according to their base input/output (I/O) port addresses. For more information, see 9, Managing Devices.

As you can see, data integrity is an important concept related to the accuracy, validity, and correctness of the data To better understand some of these concepts, let s look at another example Suppose you are the owner of an online store and want to manage your company using a software application To use a software application, you must start thinking about using a database Any company, both small and large, typically has a great deal of data to store Also, because data is all around us, people want more access to this data so they can create reports and conduct analysis That is why databases are so useful Returning to your online store, at a minimum you would like to store information about your customers, products,.

A location is information that the modem uses to analyze telephone numbers in international format and to determine the correct sequence of numbers to be dialed. It does not need to correspond to a particular geographic location, but it usually does. For example, a user on a portable computer might require a dialing prefix of 9 to dial an external number from an office location or require a dialing prefix of *70 to disable a call waiting feature when placing calls from home. A location would be created for each dialing prefix and selected when dialing from each environment. Table 26-4 shows the information associated with a location.