Systems of Record and Systems of Engagement

As the mainframe moves into its 50th year and its 'death' predictions fade into folklore then the role of the mainframe evolves. A lexicon I have heard that perfectly describes the mainframe in 2013 is the System of Record. This is opposed to Systems of Engagement whose role is to provide access. 

This is just a prelude to a more detailed blog post hopefully later this week.  But thought I would solicit feedback before I expand further...