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It is not truly necessary to understand the tree structure of the Solaris heap to exploit heap-based overflows; however, for methods other than the most simple

The Component Object Model (COM) is a binary standard for building Microsoft-based component applications, which is independent of the implementation language. DCOM is an extension to COM for distributed client/server applications. Similar to RPC, DCOM hides the low-level communication by automatically generating a client-side stub (called proxy in DCOM) and a server-side skeleton (called stub in DCOM) using Microsoft s Interface De nition Language (MIDL) interface. DCOM uses a protocol called the Object Remote Procedure Call (ORPC) to invoke remote COM components. The ORPC is layered on top of the OSF DCE RPC speci cation. Figure 2.4 shows the data- ow control in a client/server application with DCOM. DCOM is language independent; clients and DCOM components can be implemented in different languages. Although DCOM is available on non-Microsoft platforms, it has only achieved broad popularity on Windows. Another drawback of DCOM is that it

To summarize, some of UWB s potential advantages include: (i) low-power operation since transceiver circuitry power requirements are low [4]; (ii) UWB transmissions are below the noise level thereby providing low probability of detection (LPD); (iii) low probability of jamming (LPJ) capabilities due to the low energy per frequency band and the use of precisely timed patterns; (iv) ability to penetrate walls and vegetation due to the lower frequencies used; (v) higher immunity to multipath fading effects due to increased diversity; and (vi) availability of precise location information, since UWB uses precise pico-second pulses for transmission and tight synchronization between the communicating nodes, which enables centimeter-accurate location determination However, UWB has a few disadvantages such as long signal acquisition times (up to a few milliseconds [9, 10]), and FCC regulatory issues.

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There are also several technical challenges at the physical layer to be resolved such as: antenna design, propagation and channel modeling, devices and circuits design, and waveform design UWB-based networking is currently being predominantly considered for WPANs, which are de ned as networks formed by low-power wireless devices with relatively short transmission distances The technology for WPANs is in its infancy and is undergoing rapid development as part of several standards projects including IEEE 802153a and the Multiband OFDM Alliance (MBOA, [11, 12]) In addition; the application of UWB for wireless sensor networks is also being explored In this chapter, we present a survey of UWB based networks and some of their applications The chapter is organized as follows Background material on UWB technology is presented in Section 132 In Section 133, research on medium access control protocols for UWB networks is presented In Section 13.

Using information gathered from her research, she explains that her name is Norma Todd from the Cleveland office Using a ruse that should by now be familiar to you, she says she'll be traveling to corporate headquarters for a week, and she'll need a voice mailbox there so she won't have to make long distance calls to check her voice mail messages No need for a physical telephone connection, she says, just a voice mailbox He says he'll take care of it, he'll call her back when it's set up to give her the information she'll need In a seductive voice, she says "I'm on my way into a meeting, can I call you back in an hour When she calls back, he says it's all set up, and gives her the information-her extension number and temporary password.