What is a run-time system? How does it differ from a “mere” library? List some of the major tasks that may be performed by a run-time system. What is a virtual machine? What distinguishes it from...

What is a run-time system? How does it differ from a “mere” library? List some of the major tasks that may be performed by a run-time system. What is a virtual machine? What distinguishes it from interpreters of other sorts? Explain the distinction between system and process VMs. What other terms are sometimes used for system VMs?