Opportunity: Most operating systems ...take or provide provision for audit trail.


              Further to as published in the document below  'projects.pdf' 
              ....viz. embedding a RDBMS ...viz. the concept of dirty logging

              ...deriving from the concept of  save-points ...ability to restore
              ...specific point in time viz. the state of the OS ....also replicate
              the OS state ...or replay the log ....to see the sequence of events,
              when restoring to a point in time.


              Applicable to even the GUI ...viz. replay GUI state ...to see the sequence
              of events when restoring to a point in time.

              
Note: The above problem statement having been encountered in various scenarios
      and detailed in various 'Proof of concepts' as mentioned in 
      
       http://uk.geocities.com/ravivenkatus/projects.pdf
       http://ravishankarkv.tripod.com/projects.pdf
        ....apply appropriate
      'use-case' modeling, rationalize and arrive at a workable and feasible 
       solution both commercially and techinically viable.
