Reserved words are part of the Pascal language, and cannot be redefined. They will be denoted as this throughout the syntax diagrams. Reserved words can be typed regardless of case, i.e. Pascal is case insensitive.
We make a distinction between Turbo Pascal and Delphireserved words, since in TP mode, only the Turbo Pascal reserved words are recognised, but the Delphiones can be redefined. By default, Free Pascal recognises the Delphireserved words.