Set option or local variable {varname} in window {winnr} to {val}. Tabs are numbered starting with one. For the current tabpage use |setwinvar()|. {winnr} can be the window number or the |window-ID|. When {winnr} is zero the current window is used. Note that autocommands are blocked, side effects may not be triggered, e.g. when setting 'filetype' or 'syntax'. This also works for a global or local buffer option, but it doesn't work for a global or local buffer variable. For a local buffer option the global value is unchanged. Note that the variable name without "w:" must be used. Examples: :call settabwinvar(1, 1, "&list", 0) :call settabwinvar(3, 2, "myvar", "foobar") This function is not available in the |sandbox|. Can also be used as a |method|, the base is passed as the fourth argument: GetValue()->settabwinvar(tab, winnr, name)