Operating systems Detailed answers required.

1. Multi-programming (or multi-tasking) enables more than a single process to apparently execute simultaneously. How is this achieved on a uniprocessor?
2. What are the key tradeoffs between hardware virtualization and OS-level virtualization?

The paper states, "VAX/VMS, then, is a collection of procedures that exist in the address space of each process." Explain in your own words what this statement means