Hi Kent, there's some information on both Network and Sweep in the help file - check out the reference section of the help file which has an entry for every command, often with some screenshot illustrations.

Here's the entry for Network:
http://moi3d.com/2.0/docs/moi_command_reference7.htm#network

And here's the one for Sweep:
http://moi3d.com/2.0/docs/moi_command_reference7.htm#network


Also there's some more discussion on what kind of curve structure is required for Network here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=4384.4
http://moi3d.com/forum/index.php?webtag=MOI&msg=1778.6

- Michael