def authGSSClientUserName(context):
    """
    Get the user name of the principal authenticated via the now complete
    GSSAPI client-side operations, or the current user name obtained via
    authGSSClientInquireCred. This method must only be called after
    authGSSClientStep or authGSSClientInquireCred return a complete response
    code.

    @param context: The context object returned from L{authGSSClientInit}.

    @return: A string containing the user name.
    """
