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- Objects can be interfaced as if they are a simple scalar, array, hash, or
file-handles. In the main program, you think to work with a basic
element, but there is more behind the scene.
- A tie translates access to the variable which represents the invisible
object into calls to methods of that object.
- It is easy to create a database behind a hash later, without changing the
rest of your program in more than a few lines.
- In Tk, ties are used to change the value on a Label/Entry on the moment
a variable changes value. We'll see more on that.