Perl/Tk saves your favorite tools

• Ties can be hidden behind scalars, arrays, hashes, file-handles.
• They translate access to the variable into calls to a hidden object.
• It is easy to create a db later behind a hash, without changing the rest of your program more than a few lines.
• In Tk, ties are used to change the value on a Label/Entry on the moment a var changes. We'll see more on that.