Document based on 3/19/08 brain dump from Peter.  Supersedes https://svn.enthought.com/enthought/wiki/EnableConcepts
Document based on 3/19/08 brain dump from Peter. 
Supersedes https://svn.enthought.com/enthought/wiki/EnableConcepts

tommy-u/enable,tommy-u/enable,tommy-u/enable,tommy-u/enable