13. Advanced topics. Sorting lists, multithreading (synchronization), 
    client server programming (sockets, etc)

*) Control the RCX from a computer/Palm. In a "busy" environment
   (addresses for each palm/rcx)

*) Subsumption based programming, or different control architectures. 

*) have a maze, and give the rcx a map of the maze, and make it
   work on trying to figure out where in the maze it is, and have
   it get out.

*) Threads to update the screen with status info.