$2\mathrm{.}1$ What are the most important ideas, keywords, and phrases that are stated in the definition of a system?

$2\mathrm{.}2$ Explain the relationships among the following words: system, environment, boundary, and interface.

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$2\mathrm{.}4$ Explain what is meant by the architecture of a system.

$2\mathrm{.}6$ What is the primary concern of application architecture? Give an example of application architecture, either your own, or one from the examples in the book Explain how this example fulfills the features and requirenents of the concept of application architecture.