From: Dale Martenson <dale.martenson@...>
Date: 2005-11-27T09:17:30+09:00
Subject: Re: How do two objects communicate?

Depending on the relationship between the classes, you may want to look
at Observable. Observable is commonly used when you wish to have one
class notify a number of observes of a change in the object being
observed.

http://www.ruby-doc.org/stdlib/

Look for information on 'observer'.

--Dale