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Recognizer PDF-417 2d barcode in C#.NET This page intentionally left blank

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PDF417 Scanner In C#.NET
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PDF-417 2d Barcode Scanner In C#
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CHAPTER
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Bar Code Decoder In C#
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Setting Up the Network
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PDF-417 2d Barcode Reader In Visual Studio .NET
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Reading PDF417 In .NET
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Scan PDF-417 2d Barcode In VB.NET
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3
Decode EAN 128 In C#.NET
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Read UPC-A In C#
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Before computers can take advantage of WiFi connectivity to share files, printers, and other resources, including a high-speed Internet access connection, they must be configured for networking In the Windows environment, computers running Windows 95/98/ME must be manually configured Computers running Windows NT/2000 are usually configured by the IT department before being issued to employees Windows XP, however, comes with integral support for WiFi, which means that many of the network configuration chores are done automatically without needing to install drivers and enter detailed information screen after screen Once the computers are properly configured, regardless of what version of Windows they might be running, they will be accessible to each other over the network With the addition of software, even Apple computers can share the same wired local area network (LAN) and wireless access point (AP) connections Although WiFi promises wireless connectivity within a building, campus, or region, cabling is still occasionally needed If the wired LAN is being extended via an AP or bridge, for example, then these devices must be connected to the LAN with standard Category 5 (CAT 5) cable Often, one or more APs will be cabled to a hub or Ethernet switch so mobile users can connect with other users on the wired LAN If the APs are connected to a switch that supports Power over Ethernet (PoE), AC power can be conveyed to the APs over the unused pairs within the CAT 5 cable, eliminating the need to position them near a power outlet If the switch does not support PoE, then a separate device called a power injector can be used, which is colocated with the switch in a telephone closet
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1D Scanner In Visual C#
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Types of Networks
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Two types of networks are available: client server and peer to peer Both are used in the corporate environment, and wireless connections using WiFi-compliant equipment are easily accommodated to extend connectivity to notebook computers and other portable devices Telecommuters, however, will usually have a peer-to-peer network Not only is a clientserver network unnecessary, but the peer network is cheaper and easier to set up, and requires little technical expertise to troubleshoot and administer
Decoding ANSI/AIM Code 39 In None
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Recognizing Data Matrix In Visual Studio .NET
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Setting Up the Network
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Recognizing PDF417 In Java
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Client-Server Network
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Decode Code 3 Of 9 In None
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In a client-server network, an application program is broken out into two parts, appropriately called the client and server, which exchange information over the network (see Figure 3-1) The client portion of the program, or front end, is run by individual users at their computers and performs tasks such as querying a database, producing a printed report, or entering a new record These functions are carried out through a database specification and access language known as Structured Query Language (SQL), which operates in conjunction with existing applications The front-end part of the program executes on the user s workstation, drawing upon its random access memory (RAM) and central processing unit (CPU) Sometimes the servers are used for routine office applications, which the clients can use on a first-come, first-served basis Before users are granted access to metered applications, the software inventory is checked to determine whether copies are available If no copies are available, a status message is issued, indicating that all copies are in use The user waits in a queue until a copy becomes available This software metering enables the network administrator to control the concurrent usage of each application The network administrator can also choose to be notified when users are denied access to particular applications when all available copies are in use This may identify the need to pay an additional license charge to the vendor so more users can access the application
Figure 3-1 A simplified model of the client-server architecture
3
The server portion of the program, or back end, resides on a computer that is configured to support multiple clients, offering them shared access to numerous application programs as well as to printers, file storage, database management, communications, and other resources The server not only handles simultaneous requests from multiple clients, but it also performs administrative tasks such as transaction management, security, logging, database creation and updating, and asset management The network consists of the transmission facility usually the wired LAN Among the commonly used media for LANs are coaxial cable (thick and thin), twisted-pair wiring (shielded and unshielded), and optical fiber (single mode and multimode) Increasingly, wireless links are being used to link clients and servers When linking client-server computing environments over the wide area, other facilities and services come into play T-carrier links provide bandwidth in a range of increments from 64 Kbps to 45 Mbps, whereas optical carrier links provide bandwidth in the multigigabit-per-second range Carrier-provided services may also be used, such as IP-based virtual private networks (VPNs), frame relay, Asynchronous Transfer Mode (ATM), and metro-area Ethernet
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