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On Wed, 9 Mar 2011, David Given wrote:

Algol-68, of course; one of its transcription modes effectively
distinguishes keywords from identifiers by font.

The decision whether END (or PROC or NOT) is a keyword is completely left to the lexical scanner. On modern machines you'd use upper case for keywords (and operators), but all the 'stropping conventions' are decided by the lexer.

Algol-68 has plenty of other 'interesting' features (look at formatted I/O :-)), but this is not one of them