The agent can use the Notify procedure to send a text message to the simulator. The message will be displayed in the text area. Use this for debug output.

Use this procedure to display a symbol on the map in the simulator. This is also a form of debug output. The symbols are enumerated in symbols.ads.

Display a number symbol on the map in the simulator.

Remove a symbol from the map in the simulator.

Remove all symbols from the map in the simulator.

The agent should raise this whenever it finds a rule unacceptable, preferably in Inform_About_Rules.