How can I prevent the customer from seeing admin comments about them or their order?

[RodG]

I know when you uncheck the "Notify customer" the customer dont get any emails.

I have created a test customer and because of the updates and notes i need to write sometimes in the comment about the customer (what has been done etc), sometimes i dont want to inform the customer about this.

Unchecking the "Notify customer" dont send email to him, but the comments are however posted.

How can i do it that whenever i uncheck the "notify customer" the comments are not posted on his order and that he also dont get mail?

I'll avoid your question with a piece of advice.
Never ever use the comment field (or similar) to store information that you don't want a customer to see. If you don't want them to see it, simply don't store it.

Comments such as "what a sucker" stored in a database will eventually reach the wrong hands, usually at the most inappropriate time too.

I can appreciate the desire/need for a non visible comments field, but do be careful what you use it for.

Cheers
Rod