Abstract: Systems and methods for delivering a training course whose content is independent of the delivery technology and whose content is deliverable in future delivery technologies without significantly rewriting or recoding the training course. For a training course, an XML version of the content of the training course is generated. The XML version of the content can be accessed through a content module which provides an interface to a viewer that corresponds to a selected delivery technology. The same content can be provided through different delivery technologies by using the appropriate viewer. This preserves the viability and life of the content because it is easily adapted to different delivery technologies. A graphic treatment for the content is also independent and separately changeable. Also, a instruction strategy for determining how to present the content is provided.

Abstract: A method for controlling communications between endnodes in a packet-switched computer network includes dynamic window sizing and dynamic packet metering. Dynamic window sizing regularly probes the network to determine whether higher throughput is available at an increased window size, and avoids unnecessary decreases in window size after a packet is dropped or all available data has been transmitted. Dynamic packet metering regularly adjusts the rate at which packets are transmitted in response to changes in the measured propagation rate of packets through the network. To avoid unnecessary ack packets, acks are bundled together and piggybacked on returning data packets when appropriate. The invention provides control even if the address of an endnode changes. The invention also supports multiplexing several logical connections over a single transport session and combining data from several connections in a single packet, as well as construction of packets in a network-layer-independent format.