No thread priorities
When a session is underway, there are three program-specific threads running: the universe thread, the refresh thread, and the mover thread. You can prioritize these threads to fine-tune the animation, but priorities aren't critical for this program. Instead, the threads work things out themselves through a simple locking scheme. To see concurrency control in action, see "Destroying actors cleanly" (page 39).
Minimal protocol
for TAbstractActor
The protocol for TAbstractActor is minimal. For example, it is possible to put explosion behavior directly in TAbstractActor. However, future clients of the Universe subsystem might not want that behavior. Because TUniverse doesn't require explosion behavior, you need not implement it.
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