19. In a system having a plurality of controllable functions, apparatus comprising: means for storing text data representing text information for guiding a user in controlling said functions; said text information including a first string of text and a second string of text identical to said first string of text except for a change of format; said first string of text is represented by a text string representative code word corresponding to an address of a memory location of said storage means which contains text data representing said first text string; said second string of text being represented by a format change code word associated with said text string representative code word; means for retrieving said text data from said storing means; said retrieving means utilizing said text string representative code word to address said memory location containing said text data representing said first string and converting said text data representing said first text string into text data representing said second text string when said format change coded word is associated with said text string representative code word; and means for generating text representative signals capable of causing the display of said text information by a display device in response to said text data provided by said retrieving means.
19. In a system having a plurality of controllable functions, apparatus comprising: means for storing text data representing text information for guiding a user in controlling said functions; said text information including a first string of text and a second string of text identical to said first string of text except for a change of format; said first string of text is represented by a text string representative code word corresponding to an address of a memory location of said storage means which contains text data representing said first text string; said second string of text being represented by a format change code word associated with said text string representative code word; means for retrieving said text data from said storing means; said retrieving means utilizing said text string representative code word to address said memory location containing said text data representing said first string and converting said text data representing said first text string into text data representing said second text string when said format change coded word is associated with said text string representative code word; and means for generating text representative signals capable of causing the display of said text information by a display device in response to said text data provided by said retrieving means. 20. The apparatus recited in claim 19, wherein: said format change code word precedes said text representative code word.