1.What is limited direct execution (LDE) and how can it be used to implement system calls?

2.How does the abstraction of virtual memory make memory easier for a process to use? What are some of the technical problems the OS / Hardware must solve for this abstraction to work? What are some of the specific techniques used to address those problems?

3.List and define the four conditions needed for a deadlock to occur. Describe the basic techniques we can employ to counteract each condition.

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