Online chat solutions have been very popular long before AJAX was born. There are numerous reasons for this popularity, and you’re probably familiar with them if you’ve ever used an Internet Relay Chat (IRC) client, or an Instant Messenger (IM) program, or a Java chat applet. AJAX has pushed online chat solutions forward by making it easy to implement features that are causing trouble or are harder to implement with other technologies. First of all, an AJAX chat application inherits all the typical AJAX benefits, such as integration with existing browser features, and (if written well) cross-platform compatibility.
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PacketLogic has predefined user interfaces that are powerful and easy to use, such as the client and the Webstatistics. However, when the need arises to do something that is not defined in those interfaces, they are not possible for the end user to modify or customize. This is when using an API is very effective. Using the PacketLogic Python API provides access to virtually all the functionality available in the existing user interfaces, but with full possibilities to customize, integrate, and otherwise adapt the interface according to local and site-specific requirements. The PacketLogic Python API is implemented as a Python module, which means writing scripts to interface with a PacketLogic unit is a matter of:
1. Installing Python Python is available for free for all major operating systems.
2. Installing the API The API is available for free as a download from Procera Networks, on Windows and Linux operating systems.
3. Writing scripts
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This book shows you how to write programs for the MRG Messaging component of the Red Hat Enterprise MRG distributed computing platforming using the Apache Qpid API. It also gives basic information on downloading and installing MRG Messaging. For more complete information on how to download and install MRG Messaging see the MRG Messaging Installation Guide.
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Threads play a major role in applications programming today. For example, most Web servers are threaded, as are many Java GUI programs. Here are the major settings in which using threads has been founded convenient and/or efficient:
• Programs with asynchronous events:
Here the program must be ready for various events, but does not know the order in which they might occur. For example, in Sections 3.1 and 3.2, we have a network server connected to several clients. The server does not know from which client the next message will arrive. So, we have the server create a separate thread for each client, with each thread handling only its client.
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The Vision 7.1 Development Module is for engineers and scientists who are developing machine vision and scientific imaging applications. The development module includes NI Vision Assistant 7.1—an interactive environment for developers who need to quickly prototype vision applications without programming—and IMAQ Vision 7.1 for LabVIEW, LabWindows™/CVI™, and Microsoft Visual Basic—a library of powerful functions for image processing. In addition, the development module includes NI-IMAQ 3.0, the National Instruments driver software for controlling IMAQ hardware products.
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This document outlines new functionality, system requirements, installation procedures, and descriptions of the documentation included with the NI Vision Development Module. The NI Vision Development Module is for engineers and scientists who are developing machine vision and scientific imaging applications. The NI Vision Development Module includes NI Vision and NI Vision Assistant. NI Vision is a library of powerful functions for image processing, and is available for LabVIEW, LabWindows™/CVI™, and Microsoft Visual Basic. NI Vision Assistant is an interactive environment for developers who need to quickly prototype vision applications without programming. In addition, the NI Vision Development Module ships with the NI Vision Acquisition Software CD, which includes National Instruments driver software for controlling image acquisition products.
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The Java language has revolutionized the way we program applications for the Internet. Two great ideas make this language so promising:
• Applications written using Java run on multiple different platforms.
• Automatic memory management or garbage collection (GC) comes as a great relief for developers.
Other than these two issues, most of the remaining Java features can be implemented using the majority of other languages. Since its first public release in 1995, the Java language has been maturing and consolidating its position in the market as an increasing number of organizations realize its built-in strengths.
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Borland Delphi is known to be a great environment for the development of stand-alone and client-server applications on the Microsoft Windows platform. Its virtues range from full OOP support to visual development, in a unique combination of power and ease. However, the new frontier of development is now Internet programming. What has Delphi got to offer in this new context? Which are the features you can rely upon to build great Internet applications with Delphi? That’s what this paper intends to reveal. We’ll see that Delphi can be used:
• For direct socket and TCP/IP programming;
• In conjunction with third-party components that implement the most common Internet protocols, on the client or the server side;
• To produce HTML pages on the server side, with the WebBroker and Internet Express architectures;
• As well as to work with Microsoft’s core technologies, including MTS, COM, ASP, and ActiveX.
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