15.20.4  STRING 

You may define strings for "Lexicals"
     TD:DEFINE STRING name 'string'
A lexical of the form S_name is give the string

                                  Example
     TD:DEFINE STRING NAME 'George Washington
     TD:TITLE TOP 'The first president was ' S_NAME
     TD:TYPE 'NAME="' S_NAME '"'

You  may  show  all  defined  strings  with  the SHOW STRINGS command.  An
individual string may be examined by the TYPE command.
     TYPE S_name