Explain the distinctions among concurrent, parallel, and distributed. Explain the motivation for concurrency. Why do people write concurrent programs? What accounts for the increased interest in...

Explain the distinctions among concurrent, parallel, and distributed. Explain the motivation for concurrency. Why do people write concurrent programs? What accounts for the increased interest in concurrency in recent years? Describe the implementation levels at which parallelism appears in modern systems, and the levels of abstraction at which it may be considered by the programmer.