The NBC Language
This section describes the NBC language itself. This includes the lexical rules used by the compiler, the structure programs, statements, and expressions, and the operation of the preprocessor.
Unlike some assembly languages, NBC is a case-sensitive language. That means that the identifier "xYz" is not the same identifier as "Xyz". Similarly, the subtract statement begins with the keyword "sub" but "suB", "Sub", or "SUB" are all just valid identifiers - not keywords.