1. Server/Client
----------------

In a Tangence system, one program is distinct in being the server. It is
the program that hosts the actual objects being considered. It is also
the program that holds the networking socket to which the clients
connect.

The other programs are all clients, which connect to the server. While
each client is notionally distinct, they all share access to the same
objects within the server. The clients are not directly aware of each
other's existence, though each one's effects on the system may be
visible to the others as a result of calling methods or altering
properties on the objects. Internally, the clients will use proxy objects
through which to access the objects in the server. There will be a
one-to-one correspondance between server objects and client proxies. Not
every server object needs to have a corresponding proxy in every client -
proxies are created lazily when they are required.