The Irish twins gave wacky renditions of Ghostbusters,We Will Rock You and Oops, I Did It Again on The X Factor before being voted offthe talent show.
VisualVM is a tool that provides a visual interface for viewing detailed information about Java applications while they are running on a Java Virtual Machine (JVM).
Virtual machine. In computing, a virtual machine (VM) is an emulation of a computer system. Virtual machines are based on computer architectures and provide functionality of a physical computer. Their implementations may involve specialized hardware, software, or a combination.