As a rule of thumb any sitedoclet will have an associated superdoc to go along with it. Normally it will have the same name but for omitting the 'sitedoclet' part of the title. So Recently Active Threads Faqlet sitedoclet is the sitedoclet used by Recently Active Threads Faqlet. The reason these arent the more usual sitefaqlet type (where there is no need for a superdoc) is because the RAT Faqlet needs to be able to output html that isnt legal in a sitefaqlet. Thus the illegal stuff is handled by the superdoc, and the normal stuff is contained in the sitedoclet so the SDC can manage it.

sitefaqlets are text nodes maintained by SDC that are directly visible to the user. sitedoclets are text nodes maintained by SDC that will be inserted into a superdoc as dictated by the pmdevil responsible. Thus allowing SDC to maintain the documentation/text independently of pmdev.