S/MIME and Certificates for iNotes

1.- ¿Is it possible to sign up electronically emails through an iNotes v6 email client using a standard digital certificate X.509 v3?.

2.- ¿Is it possible to encipher emails through an iNotes v6 email client using a standard digital certificate X.509 v3?.

3.- ¿How is it handled or managed a standard X.509 v3 certificate in an iNotes v6 email client?.

4.- ¿Does this X.509 v3 certificate managing depend on the web navigator?.

I undertand that the certificate repository used would be the navigators one. Specifically I need this information for the Microsoft explorer v5&v6 and for a Netscape, Opera and Mozilla over a Red Hat Linux.

Thank you very much.