what's most popular comment method for small business?

Unfortunately a forum is not the answer.

I would recomend something like a threaded discussion per item.

A bit like the forum portal systems.

I mean inline comment!

inline comment for small business system: PHP + mysql.
Or I ask what method will you use in documentation - making inline comment? 
A) Using common specification
B) Using phpDoc
C) Using xml
D) Using javaAPI documentation generator
E) other

I'm still wondering what the point of the question is, to be honest. Also, what exactly the specific question is. I mean, inline documentation commenting is still a bloody vague description.

If you are designing your own system, there is no preferred method, other than simplicity and legibility. Keep it simple. Other than that, each person on here will have their own semantic preferences for just about everything. I, for one, like, and generally use, *nix type semantics in most things. I merely adapt it slightly to blend in with whatever exists. If you're starting with a clean slate, however, then take your pick.

That makes more sense. *nix type semantics refers to unix, (or any of the *nix family, i.e: Linux), type method of commenting, or creating documentation. It's not a specified format, but more of an inherited way of doing things.

I do believe there is a programme which pretty much does what you're suggesting above. Can't think of what it's called offhand, but if I can dig the info out, I'll post the link.

With regards to your comment method, if xml type commenting is what you want, there's no reason not to use it.