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and contact a server and/or other users. The participants must agree on the media to be used, codecs, ports, QoS, etc. At a later stage, the session may be modi ed, e.g. by removing a medium or by adding a participant. Finally, the session must be torn down and all the participants hang up. Session control is complicated by the fact that a user, let us call him Bob, may own several devices and, depending on the circumstances, would like to handle a session from one device and not the other for example, he would like to receive sessions on his laptop while at work, on his xed phone while at home and, generally, all sessions initiated by his girlfriend on his mobile phone. Each device is reachable under a different address, e.g. the laptop answers on a temporary IP address and the xed phone answers on an ISDN phone number. Furthermore, on the xed phone only the medium voice is welcome, whereas on the laptop any medium, e.g. video, shared whiteboard, etc., is acceptable. We can divide the problem of session control into the sub-problems of determining and locating the currently preferred device of the other participants, and then contacting the participants and negotiating session parameters. We will see how these sub-problems are solved in the following discussion on SIP.

In time, it is likely that video will enter the help equation, allowing support staff to see what is on the customer s screen and prompt them through corrective steps. Until then, the needs for a good telephone help line are the same as for other help media. Widely publicize your Help hours. Don t keep the customer waiting longer than three minutes. Have the answer (or find out and phone them back). Be polite regardless of the provocation. Have good search systems on your side.

Figure 10.4: Eyetools' fancy headgear kept track of precisely where on the screen the surfer was looking. These days, Eyetools uses an infrared camera that watches the pupils to track precisely where on the screen a surfer is looking without the subject feeling like a brain donor in Dr. Frankenstein's lab. Eyetools watches how people look in order to find design flaws and dead zones based on eye movement. In one amazing test, they altered the E*Trade home page. First they removed the text from the E*Trade Highlights, leaving just the bullet points to see if people would look at the choices for different lengths of time. Then they put the words back, scrambled, and only 5 percent of the test subjects even noticed that the words were garbled. Not only does Eyetools reveal site design flaws and dead zones, they also have patented software that analyzes the eyes' behavior to determine whether the surfer is reading, is confused, or is daydreaming. "The finest subtleties in layout and design can dramatically alter what a viewer actually looks at. You can measure how those changes guide a viewer's optical path further into your site-or drive them to your competition's," says Edwards. Eyetools usually tests more than a dozen people. After that, no statistically significant new information is gathered. The data can point out the need for changes in layout, images, color, spacing, fonts, and animation, and then they can test the results of those changes. But how long does it take people to understand what they see

As FaultMon starts, you should see a series of events displayed. You can ignore these events they are related to FaultMon initialization and are irrelevant to our testing. Now that FaultMon is running and monitoring events, let s open another shell on our attacker machine. The second shell should be opened on the machine where RIOT is located. In the second command shell, start RIOT by entering the target IP address of the host you are auditing as well as the port number on which the Web server is listening. If the IP address of the Web server is 192.168.1.1 and the port on which it is listening is 80, issue the following command:

With the SNR f,l calculated, the bit error rate for the forward link can be determined for a given modulation scheme. For example, with binary phase-shift-keying

The quickest way to write code is to cut and paste from code that already works. If you re writing an exploit, it doesn t matter so much whether the code you re cutting is your own or someone else s, as long as you understand exactly what it s doing. If you don t understand what a piece of shellcode is doing, it is probably quicker in the long run to write something to perform that task yourself, because you ll then be able to modify it more easily. Once you have a few working exploits, you will tend to settle into using the same generic payloads, but it is always useful to have other, more complex codes nearby for easy reference. Simply put code snippets into some easily searchable form, such as a hierarchy of directories containing text files. A quick grep and you ve got the code you need.

When negotiations come to a close and all parties make it clear that they accept the results, the case is closed. If you try to re-open negotiations after receiving written confirmation of your terms of employment, you will be seen as unprofessional and could jeopardize the offer.