SMIL - A standard for synchronized multimedia
SMIL (pronounced "smile") stands for Synchronized Multimedia Integration Language is a sub-set of XML, which
is a proposed new specification from the W3 Organization. It's a proposed standard for presenting time-based content
such as video and audio. The standard is still pretty new, and not all software makers have embraced the standard.
The RealPlayer G2 supports SMIL to some extent. But the idea of a multimedia standard is somewhat antithetical to
Macromedia's Shockwave efforts, so don't expect to see Macromedia support for SMIL anytime soon.