The Hyper House stack is the part of HyperBBS where the login messages, main menus, etc., reside. In order to edit the structure of the BBS, you edit this stack.
Included in this stack are cards or backgrounds which will send out a message (notice) when the user reaches it, ones which will login in the user, and ones which will present a list of choices (buttons) to the user. By rearranging the cards in this stack, you can change the structure and operation of the BBS. But that's what we'll talk about in step 3, on customizing...