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SPEW Iteration 2 Use Cases

UC1 - Iteration 1: Export peer-to-peer network activity from ODIN run.
Revised UC1 - Export peer-to-peer network activity from ODIN run (alternative flows added).
   UC1.1 - File Permissions Error: User lacks permission to create or write to desired log file.
   UC1.2 - Diskspace Error: Filesystem selected for log file is out of disk space.
   UC1.3 - General Error: There is an error writing events to log file after execution is underway.
UC2 - Iteration 1: Display animation of network topology formation.
Revised UC2 - Display animation of network topology formation (alternative flows added).
   UC2.1 - User specifies ODIN log file on command-line
   UC2.2 - Invalid File Error: User may specify an invalid file (e.g. a jpeg image) or a corrupted file.
   UC2.3 - File Permissions Error: The operating system doesn't allow the user to read the file they've selected.
   UC2.4 - User may find no file they want to visualize and wants to cancel loading a file.
   UC2.5 - User wants to terminate animation early.
UC3 - Iteration 1: Allow user to switch layout algorithm and graph display heuristics.

Use Cases Iteration 2 Readme
UC4 - Iteration 2 User visualizes traffic flow information.
   UC4.1 Change Activity Level Threshold
   UC4.2 Change Activity Transparency Level
UC5 - Iteration 2 Create ONA file for several ODIN peers executing in concert.
   UC5.1 Common Directory Already Exists
   UC5.2a Alternative ODIN peer that uses Hostcatcher
   UC5.2b Alternative ODIN peer that does not use Hostcatcher

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