Give an example of one of the four access control methods. What makes this choice unique?

Describe the role of the wait() process in regard to process termination in the detailed explanation with your own words example.   Please, I want a clear answer from your writing, not from the Internet

If you could provide an example of code, please clarify wait()'s role in process termination.

Computer screens often use the WIMP layout. The Desktop metaphor is widely used in WIMP implementations, and it maps typical operations to their concrete equivalents. To move a file, just click and drag it to its new home (a different folder or the desktop). Give us two procedures and the situations in which they might be used.