Add some text to an existing dialog box string.
This function adds (or replaces) a string in the currently active dialog box. This function must follow the start_list function, which determines: (1) which string is affected; and (2) whether the string is added to or replaces another string.
See start_list for example usage.
NOTE You also use this function when creating list boxes and drop-down list boxes in . For examples using this function in conjunction with DCL, see popup_list (drop-down list box).
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Programming Overview of DCL (Dialog Control Language)
Programming Overview of LISP (LISt Processing) Language