some newbie DC-net questions

I'm a newcommer to DC-nets, so the following questions may sound funny to somebody that actually knows DC-nets... 1) What is happening on a DC-net when nobody is sending a message? Is it simply issuing a stream of zeros? Are "coins" being continuously flipped, even when no messages are being sent? 2) What does it look like (from a traffic flow perspective) when the DC-net transitions from no messages being sent to a message being sent? The stream of zeros becomes and bunch of ones-and-zeros? 3) What happens when two members of a "table" attempt to transmit at the same time? How is this case handled? 4) Are there any DC-net papers available for downloading via FTP? Thanks, Jim_Miller@suite.com