Digital Certificate Login

[gustavoaspnet]

Hi everyone!

I need your help please to discover the technology that was used in the web site below to implement the digital certificate login:

https://www.fazenda.sp.gov.br/DEC/UCLogin/login.aspx

(click the digital certificate image then the site authenticates you using your plugged in smart card or cipher token)

I presume it is not CAPICOM, since I don't have it installed and I were able to try the login...

Could anyone, please, give me a clue? Basically, it is web application that access the digital certificate store... Anyone knows how to do it?

Thanxs in advance!