Why many of us do this: It's often easier to refer to previous posts relatively rather than to cite usernames. For "OP", others will know to simply look (or thi

Why many of us do this: It's often easier to refer to previous posts relatively rather than to cite usernames. For "OP", others will know to simply look (or think) back up to the top (or thereabouts). For "parent", it's usually the comment above the one that is being replied to. So parent to your post is what I'm referencing, but I'm now replying to you (and have taken no notice of the usernames because it's easier to focus on the content).