Ben Wing <ben(a)666.com&gt; writes: I've now looked at the specifier code, and decided that I have no clue how to implement this. I started out with something like this: DEFVAR_SPECIFIER ("vertical-scrollbar-visible-p", &Vvertical_scrollbar_visible_p /* *Whether the vertical scrollbar is visible. This is a specifier; use `set-specifier' to change it. */ ); Vvertical_scrollbar_visible_p = make_specifier (Qboolean); set_specifier_fallback (Vvertical_scrollbar_visible_p, list1 (Fcons (Qnil, Qt))); set_specifier_caching (Vvertical_scrollbar_visible_p, slot_offset (struct window, vertical_scrollbar_visible_p), some_window_value_changed, slot_offset (struct frame, vertical_scrollbar_visible_p), vertical_scrollbar_visible_p_changed_in_frame); But it seems non-obvious what each of these functions (like, say, vertical_scrollbar_visible_p_changed_in_frame) should do, and how the caches work out. Horizontal scrollbar is tougher, because it depends on other things, like truncate-lines and truncate-partial-width-windows. What should be the semantics of setting this specifier? So, if you want to have these two specifiers by 21.0, someone else will have to implement them. Kirill? -- Hrvoje Niksic <hniksic(a)srce.hr&gt; | Student at FER Zagreb, Croatia --------------------------------+-------------------------------- Unspeakable horrors from outer space paralyze the living and resurrect the dead!