One of the main benefits of application virtualization is the ability to treat heterogeneous environments as if they were homogeneous, Schwab said. It compares the two and packages the difference into a single, self-contained executable. You then install the application you want to virtualize and have the program take a second snapshot. You begin with a bare-bones OS installation, which the virtualizing program takes a snapshot of. Most application virtualization programs work in more or less the same way, said Ty Schwab, founder and senior consultant of Blackhawk Technology Consulting LLC, a Eugene, Ore., IT consultancy. Because the application does not use resources outside its environment, it's possible to run multiple versions of a program or run it on a newer operating system than it was designed for, like Vista. Each virtualized application runs within its own environment, which includes registry entries, libraries, supporting executables and anything else the application needs to run. Just as desktop and server virtualization abstract a computer's operating system from its hardware, application virtualization abstracts a program's executables, configuration files and dependencies from the operating system.
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