C166 has key words such as line, inline, ident, error. What does it means?
See section [Keywords] in file C166.ini.
"section [Keywords] in file C166.ini." It'd be helpful if you gave the full information when you start a Thread. So, now we know that you're hacking around in the "internal" files of a C166 installation, and not talking about source code! Anyway, error and line are used in #pragma directives. I don't know about the others - maybe they're just highlighted as "keywords" for compatibility with other tools whish do support them?