Added notes.

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+#+TITLE: Implementation notes and ideas
+
+* Initial actor
+  SAM has just one pre-defined actor: the system actor which can:
+  - return the terminal actor
+  - make and return network-terminal actors
+  - shut down the system
+  - save and restore system images
+    
+  As for other actors, the address of this actor is not guessable and must
+  be explicitly provided.  This is especially important for the system actor
+  as this is the only thing preventing arbitrary actors from killing or otherwise
+  interfering with the VM.
+
+* Initial behaviour
+  On startup, SAM can be passed a behaviour.  An actor with
+  this behaviour will be created and passed the address to the
+  system actor. This defines the eventual behaviour of the machine.
+