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Correct Answers: A A. Correct: Windows XP Professional installs Plug and Play devices automatically; an administrator does not need to be present. The puzzled user was able to use the Plug and Play devices because they were automatically detected and appropriate drivers were installed for him. Non Plug and Play devices are installed in the context of the currently logged-on user, and only administrators can install device drivers and make other changes to critical system files and configuration settings. The user could not install the scanner because it is not Plug and Play capable. B. Incorrect: The user told you that he downloaded Windows XP Professional drivers from the firm that built the scanner. C. Incorrect: The user believes that Windows XP Professional did detect the scanner and that he received the error messages after it had already been detected. D. Incorrect: Nothing in the question suggests that there are any resource conflicts; additionally, the user had disconnected his personal laser printer from the parallel port before attempting to install the flatbed scanner. Because the user reported no problems with the printer, it is unlikely that there are resource conflicts between the parallel port and any other device.

Correct Answers: C A. Incorrect: The Signature Verification tool (Sigverif.exe) is used to scan the computer for critical files such as device drivers and system dynamic-link libraries (DLLs). It checks to see whether each file has a valid digital signature from Microsoft; it is not used for hardware or driver troubleshooting. B. Incorrect: Manually searching the Registry is a haphazard and time-consuming approach to gathering the desired information. Launching the Sounds And Audio Devices program in Control Panel is much faster and more effective. Also, the Registry Editor tool does not include troubleshooting tools to help you resolve hardware and software problems. C. Correct: You use the Sounds and Audio Devices program to adjust volume, specify the kind of speakers you are using, create and select Sound Schemes, select devices for sound and voice recording and playback, select devices for MIDI playback, view the properties of installed sound devices, and troubleshoot installed sound devices. D. Incorrect: The DirectX Diagnostics tool is used to review, configure, and troubleshoot the hardware in a computer that interacts with DirectX. It does have a tab labeled Sound where you can test DirectSound, but it does not have detailed infor-

Composite foreign key referencing nonprimary keys Some legacy schemas are even more complicated than the one discussed before: A foreign key might be a composite key and, by design, reference a composite natural nonprimary key! Let s assume that USERS has a natural composite key that includes the FIRSTNAME, LASTNAME, and BIRTHDAY columns. A foreign key may reference this natural key, as shown in figure 8.1. To map this, you need to group several properties under the same name otherwise you can t name the composite in a property-ref. Apply the <properties> element to group the mappings:

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<class name="User" table="USERS"> <id name="id" column="USER_ID">...</id> <properties name="nameAndBirthday" unique="true" update="false"> <property name="firstname" column="FIRSTNAME"/> <property name="lastname" column="LASTNAME"/> <property name="birthday" column="BIRTHDAY" type="date"/> </properties> <set name="itemsForAuction" inverse="true"> <key property-ref="nameAndBirthday"> <column name="SELLER_FIRSTNAME"/> <column name="SELLER_LASTNAME"/> <column name="SELLER_BIRTHDAY"/> </key> <one-to-many class="Item"/> </set> </class>

mation about the sound card. You can launch the Sound Troubleshooter from the More Help tab in the DirectX Diagnostic tool or from the Hardware tab in the Sounds And Audio Devices program.

Correct Answers: B A. Incorrect: The CD-ROM drive plays audio CDs through the speakers, and the question gives no indication of other problems with the drive, so it is not clear that replacing it will solve the problem. B. Correct: When digital playback of audio CDs is enabled, the headphone jack on the front of most CD-ROM drives is disabled. To use headphones to listen to audio CDs, you have to either connect the headphones to a jack attached to the sound card or to a headphone jack built into the speakers. C. Incorrect: You can hear music through the speakers, so the CD volume and master volume controls must not be muted or turned down. There is no volume control specific to headphone jacks, so adjusting the volume levels in the Volume Control program does not resolve the problem. D. Incorrect: The Hardware Sound Acceleration Level has no effect on the volume of audio CDs. Adjusting hardware acceleration on the Display and Sound tabs of the DirectX Diagnostic tools might help to resolve stability or performance issues relating to DirectX.