Is volume of visits based on s_vi?

[Sophie_H]

Hi,

I am wondering if the volume of visits is based on the cookie s_vi ? 
if so does it mean that if I have 2 different s_vi cookie (domain are different and so the values) would it count as 2 visits ? 

Thanks a lot in advance to anyone that could help to understand which element is required to count the visits.

Sophie