Apple Duo 270C Windows let you see whats inside containers, Menus offer you choices

Documents are files containing words, pictures, numbers,
sounds—whatever you create with your programs.
The Trash is a container for files that you no longer want.
Windows let you see what’s inside containers
Windows let you see what’s inside all these containers.
When you open a disk icon, the window that appears shows you
what’s on the disk. When you open the document icon
representing a memo, the window that appears shows you
the memo.
Changing the size of a window or viewing its contents does
not change the contents. The contents remain the same; only
your view changes.
Menus offer you choices
Like the menus in a restaurant, Macintosh menus let you
choose. You choose among different actions that the computer
can perform on containers (icons), or on their contents (such as
words in a memo).
44 Chapter 2: Working on the Desktop