Certificate extension ??

[Cedric Malderez]

Hello !!

I'm looking for a document that could tell me wich extention is needed in
Netscape and Internet Explorer to be used for:
- SSL (client side).
- S/MIME (signing an/or crypting).
- Signing object ...

Where may I found this kind of information ??
Is there specific extension for particular browser ??

Please help me :-)

Thanks !