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.
The Display_Symbol_On_Map procedure
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.
The Display_Number_Symbol_On_Map procedure
Display a number symbol on the map in the simulator.
The Remove_Symbol_On_Map procedure
Remove a symbol from the map in the simulator.
The Remove_All_Symbols_On_Map procedure
Remove all symbols from the map in the simulator.
The exception UNACCEPTABLE_RULES
The agent should raise this whenever it finds a rule unacceptable,
preferably in Inform_About_Rules.
