     /** The SpawnedYard objects created by spawnYard. */
     private static var _spawnedYards :Dictionary = new Dictionary();
 
-    /** Heartbeats requested in this playground. */
+    /** Heartbeats requested in this yard. */
     private static var _hearts :Array = new Array();
 
     /** Only set when spawning a yard. */

/** Tracks the things needed for a spawned yard */
class SpawnedYard
{
    /** The playground object. */
    public var yard :Yard;

    /** The heartbeat function within the playground to call as often as possible. */
    public var heartbeat :Function;

    /** The trace function within the yard. */

        bridge :EventDispatcher) :Yard
    {
        if (!Thanette.isSystemYard()) {
            throw new Error("Non-system yard spawning");
        }

        if (yardId == null || yardId.length == 0) {
