This book constitutes the refereed proceedings of the 4th International COST 237 Workshop, held in Lisboa, Portugal, in December 1997 of the European COST Programme on Multimedia Telecommunication Services. The 12 revised full papers presented were selected from 24 submissions. The topics covered include multimedia presentation, QoS Control, electronic commerce, CORBA and DCE, real-time multimedia, multimedia conferenceing, multicast networking, heterogeneous communications environments, and others.

InhaltsangabeOperator based composition of structured multimedia presentations.- SECCO - support environment for electronic commerce.- A bridge for heterogeneous communication between CORBA and DCE.- Distributed connection management for real-time multimedia services.- Evaluation of different video encryption methods for a secure multimedia conferencing gateway.- The FreeBSD audio driver.- Cell discarding mechanisms with minimum flow quality.- Implementing the digital storage media - command and control (DSM-CC) standard in the framework of an on-line service.- Resource selection in heterogeneous communication environments using the teleservice descriptor.- AMnet: Active multicasting network.- Impact of virtual group structure on multicast performance.

The 12 revised full papers presented were selected from 24 submissions. The topics covered include multimedia presentation, QoS Control, electronic commerce, CORBA and DCE, real-time multimedia, multimedia conferenceing, multicast networking, heterogeneous communications environments, and others.