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Get rich multimedia services across next generation packet-switched and traditional circuit-switched networks with IP Multimedia SubSystem (IMS). These are component simulators that enable simple testing and message validation and that are not dependent on IMS servers or architecture.

The bash shell is available on many Linux and UNIX systems today, and is a common default shell on Linux. In this tip you will learn how to handle parameters and options in your bash scripts and how to use the shell's parameter expansions to check or modify parameters.

Minimize the time required to manage memory and maximize available memory for general usage with the slab allocator. This article explores the ideas behind the slab allocator and examines its interfaces and their use. It uses the Linux kernel method that originated in Solaris of allocating memory of objects based on their size.

Create a working Linux cluster from many separate pieces of hardware and software, including System x and IBM TotalStorage systems. Part 3 provides the first half of the instructions you need to set up the storage backend, including details on storage architecture, needed hardware, and the Storage Area Network.

In the last part of our exploration of the Second Life software, learn how to plug a simple command-line program into Second Life that provides a language translation function. This article looks at the technical issues involved in translating chat messages in Second Life.

Think you have a secure Linux system? Following best practices during installation and setup is a must, but if you haven't set up regular system auditing, you've only won half the battle. This article discusses some existing tools and offers a couple of sample scripts to automate the process in a real-world environment.

The developer documentation in the Second Life client takes the form of a wiki, making documentation easier. In Part 2 of the ongoing exploration of the Second Life software, take a look at that documentation, and use it to jump-start some modifications to the client.

ZIP? It's about time! PHP just added ZIP features to PHP V5.2. Now they're now built-in. After reading this article, you will be well versed in the art of ZIP files using the latest ZIP PHP extension, so you can reduce bandwidth overhead or storage usage when handling large files with PHP.

Learn how to develop Google gadgets, small applications you can add to most any Web page as a means to offer dynamic and rich content. You can write them for your own use and then publish them on Google, where other developers can integrate your work into their Web projects.

Speaking UNIX is simply a matter of building a sentence. An executable is a verb, output is a noun, and the shell operator is a conjunction. Virtually all non-trivial problems require you to filter good data from bad. Discover the many UNIX command line utilities that use regular expressions to discern the relevant from the irrelevant.

Develop complex, computationally-intensive programs with IBM XL Fortran Alpha Edition for Cell BE Processor on Linux. These high-performance XL compilers are derived from a common code base, helping support consistent compiler performance and ease of program portability across multiple OS and hardware platforms.

Ease the task of administrators by allowing them to manage Kerberos principals and policies on NAS-based solutions by using an interactive GUI-Based Administrative Tool; you know longer need to know the NAS commands. The tool runs on UNIX and supports AIX, Linux, Solaris, and Windows as well.

One of the many enhancements of IBM DB2 9 for Linux, UNIX, and Windows is the ability to install multiple copies of the DB2 software on the same server. In this article, you'll follow step-by-step instructions to learn how to take advantage of this enhancement in an SAP environment.

Learn how to develop and deploy your applications on Linux on IBM System p and System I POWER-based servers. This article discusses the similarities and differences that you need to be aware of for the Linux on POWER systems.

The OS for the One Laptop per Child (OLPC) is a port of the Linux kernel but with a unique interface called Sugar. In this article, learn about the Sugar human interface, and how to virtualize, use, and develop for Sugar. OLPC is targeted towards children around the world, with the missions to develop a low-cost laptop (USD100) with a novel user interface and applications that allow children to experiment with tools for expression and learning.

Distributed Image Management (DIM) is a scalable image management tool that allows blades to run a Linux distribution over the network without a local disk; no modifications to the image are required. DIM allows for fast incremental maintenance of thousands of images in seconds. It also provides an XML file that describes the cluster network and naming taxonomy.

The Linux key retention service introduced with Linux 2.6 is a great new way to handle authentication, cryptography, cross-domain user mappings, and other security concerns for the Linux platform. Learn the components of the Linux key retention service and get an understanding of its usage with a working sample application.

Recently a change in the Linux virtualization landscape has appeared with the introduction of the Kernel virtual Machine (KVM). KVM supports the virtualization of Linux guest operating systems -- even Windows with hardware that is virtualization-aware. Learn about the architecture of the Linux KVM as well as why its tight integration with the kernel may change the way you use Linux.

This technology helps publishers hide real values of sensitive data from consumers looking to analyze trends and find similarities across multiple streams. Online Stream Deviator is a module that alters the data from incoming streams in order to hide the precise values while preserving statistical properties of the data.

It looks like Rails is here to stay, and to everyone's benefit. Ruby plays very nicely with XML. In this tutorial, you will build a Rails application, discuss some basics about the way that Rails works, how it's structured and how to use it, and then you'll move on to working with XML.