The [Hide] command appears on response pages. Hiding a response suppresses the text of the response from casual view. The response header still appears to everyone, though, and if they want to see the full text all they have to do is click on the single-rersponse link.
Only the conference host or the user who posted the response may hide it. To undo a [Hide], use the [Unhide] command. And see also the [Scribble] command, which makes a response permanently unavailable.