Resumen
Metasystems give users illusions that files, databases, computers and external devices can reach over a network which constitute one giant transparent computational environment. With a metasystem, users can share files, computational objects, databases and instruments. They need not decide where to execute their programs nor copy the necessary binaries and data files. The metasystem does these jobs. A metasystem's building blocks arc geographically separated resources connected by one or more high-speed interconnections. An essential software layer, often called middleware, transforms a collection of independent hosts into a single, coherent virtual machine, giving the user the power of a unified environment. To the user, this virtual machine is a single entity that executes applications, schedules application components, detects and recovers from faults, provides protection and security to users anti-resource owners, and brings users together through enhanced support for collaboration and sharing.