] RPXP v0.74 generates SMIL 1.0 and RealText streaming
] media presentations. These can be hyperlinked via
] standard HTTP URLs. People with web publishing access can
] subset and annotate video streams into clips to which
] URLs can be distributed via email or weblog. The
] original media stream is not changed.

A very poor explanation, but basically this is software for linking to an anchor tag in a real video... So you can recommend a story from the news instead of the whole show. Expect more like this...