Links:
[1] http://wwwtest.digi-sign.com/product/root-signing
[2] http://wwwtest.digi-sign.com/winpop/roaming.php
[3] http://wwwtest.digi-sign.com/winpop/webtrust-confirmation.php
[4] http://wwwtest.digi-sign.com/digi-ca/manuals/administrator/root-signing