active text Apple event application Arrow Keys in Text ASCII Authoring background background button background field background layer background picture Blind Typing Browsing button card card button card field card layer card picture card window checkpoint class event external command external function family field field text General tools handler HyperTalk link list field locked field locked stack message Message box object Paint text Paint tools Painting palette parameter parameter variable pixel Power Keys script Scripting search path shared text stack string tear-off menu Typing user level value variable window