What does Short File Name Translation do?

The replication did me the folder where LFN(Long File Name) and SFN(Short File Name) existed together.

This function is here.
Optoin - Advanced - Short File Name Translation

And, there is no change in the file name written in the target though the setting of Short File Name Translation was changed.

I think that I behave as shown in this article.
http://support.microsoft.com/?scid=kb%3Ben-us%3B121007&x=13&y=19

However, it doesn't function.

What does Short File Name Translation do?
Please teach me.