Returns the value corresponding to key in the preference file if it exists.

	// Simple script that lets you round rotations and
	// round your positions of your selected objects.
	// and it remembers which option is being active
	class EditorPrefsBool extends EditorWindow {
		var showRoundPosition : boolean = true;
		var showRoundRotation : boolean = true;
		@MenuItem("Examples/Round positions-rotations")
		static function Init() {
			var window = GetWindow(EditorPrefsBool);
			window.Show();
		}
		function OnGUI() {
			showRoundPosition = EditorGUILayout.BeginToggleGroup("Round Position",showRoundPosition);
				if(GUILayout.Button("Round Position!"))
					DoRoundPosition();
			EditorGUILayout.EndToggleGroup();
			showRoundRotation = EditorGUILayout.BeginToggleGroup("Round Rotation", showRoundRotation);
				if(GUILayout.Button("Round Rotation!"))
					DoRoundRotation();
			EditorGUILayout.EndToggleGroup();
		}
		function DoRoundPosition() {
			for (var t : Transform in Selection.transforms)
					t.localPosition = Vector3(Mathf.Round(t.localPosition.x),
												Mathf.Round(t.localPosition.z),
												Mathf.Round(t.localPosition.y));
		}
		function DoRoundRotation() {
			for (var t : Transform in Selection.transforms)
				t.rotation = Quaternion.Euler(
								Vector3(Mathf.Round(t.eulerAngles.x / 45f) * 45f,
										Mathf.Round(t.eulerAngles.y / 45f) * 45f,
										Mathf.Round(t.eulerAngles.z / 45f) * 45f));
		}
		function OnFocus() {
			if(EditorPrefs.HasKey("ShowRoundPosition"))
				showRoundPosition = EditorPrefs.GetBool("ShowRoundPosition");
			if(EditorPrefs.HasKey("ShowRoundRotation"))
				showRoundPosition = EditorPrefs.GetBool("ShowRoundRotation");
		}
		function OnLostFocus() {
			EditorPrefs.SetBool("ShowRoundPosition", showRoundPosition);
			EditorPrefs.SetBool("ShowRoundRotation", showRoundRotation);
		}
		function OnDestroy() {
			EditorPrefs.SetBool("ShowRoundPosition", showRoundPosition);
			EditorPrefs.SetBool("ShowRoundRotation", showRoundRotation);
		}
	}