System virtualization is a technology that enables multiple operating system (OS) instances to execute independently on shared hardware. Functionally, software deployed to an OS hosted in a virtualized environment is generally unaware that the underlying platform has been virtualized. Sun performs testing of many of its products on select system virtualization and OS combinations to help validate that the products continue to function on properly sized and configured virtualized environments as they do on non-virtualized systems. For general information about Sun support for products in virtualized environments, see System Virtualization Support in Sun Java System Products. For product-specific exceptions to or extensions of this general information, see System Virtualization Support in Sun Java System Products.