What does these keywords mean?

[Mudbill]

Instead of double posting, you can just edit your previous comment. However if it has been ages since then, and your post is no longer near the top of the page (like another page), I personally see no harm in doing a bump and a double post at the same time, granted you actually have something new to tell and not just doing it for the purpose of having the thread near the top again. If you got an update to an old development thread, editing your reply won't make it show up for others as unread.

Perhaps the mods have different views on this, but I do think they agree.