This example is intended for those with little or no programming experience.
It is possible to build a network entirely from the simulator interface,
without writing any C programs at all.  This is a tedious process for all
but toy networks, but it will give you an idea of what you can do with the
simulator.

To create a simulator shell, type `makesim -ng'.  This will create an
executable file `sim'.  Type `sim' to run this executable.  The simulator
will start running and you will see the command prompt `->'.  The -ng
flag means that your simulator does not have the graphics interface.  It is
easiest to start out with the simple terminal interface.

The file `build.demo' contains the commands to build a small network.  Type
`read build.demo' to have this network build.  Then type `?' to see the
list of command available to you.  Type `help' to get the general help
message, or `help <command>' to get help information for a <command>.  For
example, try `help list' or `help disp'.

You can make more units with the MakeUnit command, add sites with the
AddSite command, and make links with the MakeLink command.  Issuing the
`go' command causes one or more simulation steps to be run.

Look at `build.demo' to get an idea of how the commands are given.  All these,
and many more, facilites are available when you program a network in C.

The network that is built consists of four units, connected in a ring.  If
you provide activation to one of them (for example `out 0 10'), and then
use `go' to simulate, you will see the activation move from one unit to the
next.  Use `list units all' to see the unit activations.

