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