Streaming with SMIL?

Hello!

My name is Laure and I am very interested in the applications of SMIL in the
multimedia world. I am specially interested in the streaming. For example,
if we want to send a smil presentation to several users (by mail or another
service) and we only send the SMIL file (not the video and audio sources,
that are supposed to be in the web), does the user need to download the
whole source files before playing? Or can they be streamed? Or both
solutions are possible? Is the streaming allowed or does it depends on the
player and the bandwidth connection? I know that you can use smil to do a
multimedia presentation with several sources that can be in different
servers, but I have been looking for examples and I have only found
applications where you have a folder with the smil text all the sources.

Thanks.

Regards,

Laure.