Comments are just parts of code that won't get executed and document stuff for you, the guy looking at the code. Naturally you need to tell the computer which lines are lines it has to execute or analyse and which lines of code are comment (which it should rather not try to execute or analyse!)
// makes a single line a comment
Code:
//this is a comment
this_is_not_a_comment
/* .... */ makes a whole block a comment, the /* starts a comment and the */ tells it that the comment has ended. It's used here to easily "enable" / "disable" whole parts of code.
Code:
/*tons of comments
over multiple lines
can go on forever
and if you mess them up it sucks to find the mistake
*/
this_is_not_a_comment_anymore
incase of the ini, the standard ini has a /* .... */ block for each of the sections by default. So usually what you need to do is remove /* and */ from the unpack section, which is what I have done in the last example.