How to control the direction of Chinese vertical text using control characters?

Can you provide a list of all the characters needed for Chinese typesetting?

There is a sidebar entry for Chinese. Is that what you are looking for?

Chinese vertical writing may involve the use of some special control characters, and this is what I mean.

Those are not relevant for the font design and so we usually don’t deal with this topics. So I can’t help you with the information.

Yes, they are empty glyphs and have nothing to do with the production process.