in <A HREF="rfc2119.html">RFC 2119</A>.

2. Extended Challenges and Extended Responses

   This document builds on the protocol and terminology specified in RFC
   1938 and assumes that you have already read this document and
   understand its contents.

   An extended challenge is a single line of printable text terminated
   by either a new line sequence appropriate for the context of its use
   (e.g., ASCII CR followed by ASCII LF) or a whitespace character. It
   contains a standard OTP challenge, a whi