RFC 2122 (rfc2122) - Page 3 of 11

VEMMI URL Specification

RFC 2122                VEMMI URL Specification               March 1997


   as specified in Section 3.1. of RFC 1738. If : is omitted, the
   port defaults to 575 (client software may choose to ignore the
   optional port number in order to increase security). The
    part is optional and may be omitted.

   This URL does not designate a data object, but rather a multimedia
   interactive service. A VEMMI service starts a multimedia session
   managing multimedia objects and interacting with the user during the
   session. To the difference of other stateless protocols, the link
   between the client and the server is usually maintained during the
   whole session (although in some cases other mechanisms may be used,
   see below).

   The  is the name of the VEMMI service to activate. This
   field is not mandatory and could be omitted for example if the remote
   host manages only one VEMMI service or activates a VEMMI service by
   default when no service is specified. If this field is omitted in the
   URL and the server requests it, it is assumed that the VEMMI client
   software will prompt the user for it.

   In addition, after the , optional attributes and values
   (parameters) associated with the VEMMI service may be specified as
   part of the URL. When present, each parameter (attribute/value pair)
   is separated from each other and from the rest of the URL by a ";"
   (semicolon). The name of the attribute and its value are separated by
   a "=" (equal sign). If present, these fields are used to transmit
   additional data useful for service selection or to request to perform
   a specific processing. For example, the $USERDATA field can be
   specified to transmit additional user-specified data to the VEMMI
   service.

4) Client/server dialog during service selection

   The VEMMI client will interpret the VEMMI URL to connect to the
   remote host and to access the specified VEMMI service. After
   connecting to the remote system, the host may prompt the VEMMI client
   for service name and user identification.

   Before starting the VEMMI session, a VEMMI terminal is in 'standard'
   mode and may display the data received from the network in a videotex
   or telnet terminal window. As the VEMMI session may be started
   anytime during an interactive videotex or telnet session, the VEMMI
   service selection is performed by a simple dialog between the client
   and the server.

   The service, username and password information are transmitted by the
   client software to the host in answer to the corresponding requests
   received from the host. The following behavior is expected from the



Mavrakis, et. al.           Standards Track