@CerstinMahlow @mpe I really like the analysis, but reading the mention of keyboards and the various keys related to pages (in particular Page Up and Page Down) I think it’s important to remember that other systems also used different labels (e.g., Prev and Next) and that the keys (when present) were sometimes arranged horizontally. I think one also should discuss block-mode terminals, which—unlike character-oriented and bitmap-oriented displays do have an intrinsic notion of “page.”