in text is cross referenced in a table in working memory 28 so that it is immediately retrievable by reference to the line and word number designated alternatively if the processor is extremely fast a direct search through the dictionary for a word corresponding to the spelling of the designated word could also be employed however this technique would make it difficult to customize the definition to a particular use of a word in the context of the text material next with reference to the flow diagram of fig7 the data from the text memory 25 fig2 a is loaded to the video ram memory 22 and hence displayed on the viewer as depicted by block 207 fig7 the program now analyzes the text memory data to determine a line and word number for each word in the text memory one such technique is to interleave between each byte of each word in the text memory a byte which is coded to represent the line and word number on that line as an example assume that the text memory derived from the concatenation data of fig5 a 5c contains the word 34 zing 34 as the second word on line one in the text memory code bytes indicative of the line and word number are interleaved so that they appear.