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instance of Sound Recorder, and while this is playing, attempt to record a sample using the second instance of Sound Recorder If the second instance of Sound Recorder cannot record a sample while the first instance is playing, the sound card does not support full-duplex audio, and thus does not work with TAPI If sound is distorted or otherwise continues to malfunction after you attempt the aforementioned procedures, the problem is most likely with the microphone, sound card hardware, or sound card driver Contact the manufacturer of your sound cards to ensure that you have the most recent Windows XP Professional drivers Also, replace the microphones and sound cards on affected computers and attempt these tests again Eliminating audio echo Audio echo is a common problem with audio-conferencing systems.

Firewalls are certainly nothing new in the computing world, but you hear more about them today than ever before. With security concerns at an all time high, numerous firewall products are available on the market, with a number of third-party software products targeted to the home user or small network. With ICF s inclusion in Windows XP, you know that these security concerns are valid and should be considered by any Internet user or network user.

Audio echo is often more detectable when using a microphone and speakers, as opposed to using a headset, which has an integrated microphone and speakers For example, echo can originate in the local audio loopback that happens when a user s microphone picks up sounds from the user s speakers and transmits them back to the other participants Normal conversation can become impossible for other participants in the conference when sensitive microphones are used, speaker level is high, or the microphone and speakers are placed in close proximity to each other TAPI 31 applications written to use the acoustic echo cancellation capabilities of either the H323 Service Provider or Multicast Conference Service Provider allow for the elimination of acoustic echo when using a microphone and speakers Another way to completely eliminate audio echo is to use audio headsets.

These eliminate the possibility of a user s microphone picking up sound that is being received from other conference participants A more expensive solution is to use special microphones with built-in echo-canceling capabilities These microphones detect and cancel out echo The main advantage to these is that users do not have to wear headsets Echo-canceling microphones are also a necessity for conference rooms because using headphones is not a practical solution Video problems in conferencing applications If the video image of an H323 conference participant cannot be seen by the other party, or if the image of a multicast conference participant cannot be seen by all other endpoints, the computer s video capture device might not be working properly See the camera troubleshooter in Windows XP Professional Help and Support Center.

Unable to publish multicast conference invitations If you cannot publish multicast conference invitations, confirm with your network administrator that a Windows directory service is available at your site The directory service provides the ability to publish IP multicast conferences..

create a table named Product, you can have a column named ProductID that is set as an identity, and you can set the identity seed to 1 with an identity increment to 1 When the first row is created in the Product table, the ProductID will be generated by the RDBMS and set to 1 The following row will have a ProductID that is set to 2, and so forth Should be as small as possible but large enough to support the number of rows it will represent Is immutable, meaning its value should never change Is also a natural key when the key has a logical relationship with the rest of the columns in the table For example, if you had a book table, the ISBN number could be used as a primary key because it uniquely identifies one book.

A firewall is a piece of hardware or software placed between two networks or computers to keep one safe from the other.

Part IV: