It is described in <034e3c2b6b3f02-gin(a)mo.msk.ru&gt; posted to <xemacs-beta(a)xemacs.org&gt; on Thu, 27 Dec 2001 18:41:03 (GMT). It is a (mis)feature of `describe-key -> key-binding -> get_relevant_keymaps': it does not search in extent keymaps when arg is string. Without such a misfeature `viper-events-to-keys' advice would be harmless. Nobody on xemacs-beta tried to explain why such a `get_relevant_keymaps' (mis)feature was needed. I Cc this to xemacs-beta again with another wording of my question. When `get_relevant_keymaps' is required to omit extent keymaps if keys are represented by string? What should we use in key-binding where such a representation of keys should be just as good as vector of events?