Maybe it's just me, but none of the command-line
commands described in
http://roundup.sourceforge.net/doc-0.8/admin_guide.html#adding-a-user-from-the-command-line
seem work on Windows. 

For example if I run "roundup-admin.bat list admin" to
list the properties of the admin user, I get an error
saying 'no such class "admin" '

Perhaps the syntax has changed since the docs were written?