mob
    NPC
        icon='npc.dmi'
        New() // New is called when the NPC is created
            spawn() // spawn() is used to schedule code to execute at a future time
                    // It's used here so that the AI_Loop(), which never finishes, won't
                    // cause the other code in New() to never be run
                AI_Loop() // Runs src's AI_Loop() procedure.
            view(src) << "I am born!"

        proc/AI_Loop()
            while(src) // While the NPC still exists, keep doing the following, repeating it forever:
                // Here's where you'd have the NPC do stuff.
                // In this example, the NPC will walk around randomly
                // and say something every few seconds.

                step_rand(src) // This causes src, the NPC, to take a step in a random direction

                if(prob(10)) // prob() deals with probabilities. Because of the 10, 10 percent of the time it 
                             // will return true, and the stuff inside the if() will happen
                             // So 1 out of every 10 steps the NPC will say "Hello world!"
                    view(src) << "Hello world!" // The NPC says hello to everyone in its view

                sleep(rand(10, 40)) // sleep() causes the procedure to pause for the amount of
                                    // time it was passed. rand() randomly chooses a number 
                                    // between the two numbers it's passed.
                                    // So in this example, the NPC pauses between 1 and 4 seconds every time
                                    // it moves