How many 'comment-start' chars for 'comment-region'?

[Thorsten Jolitz]

Hi List, 

is there any (major-mode) variable where the number of 'comment-start'
characters used when calling 'comment-region' is defined (I couldn't
find one).

E.g. its two in Emacs Lisp (';; text') but one in LaTeX ('% text'). 

Or is the only way to find out looking at the code of the respective
major-mode that implements the 'comment-region' function?

-- 
cheers,
Thorsten