You can request Internet certificates from the Verisign Internet certificate authority at http://www.verisign.com/client/index.html. On the page labeled "Choose Your Browser," you may see icons for Microsoft and Netscape, but not for Notes or Domino. In that case, click on the Netscape icon.
After filling in your personal information and submitting the form, you may see a page labeled "Error Online Enrollment Status: 3041". If that happens, you need to add the following line to your NOTES.INI file:
WebUserAgent=Mozilla/4.0 (Windows-NT)
Restart Notes and resubmit your client certificate request to Verisign.
These steps are required until Verisign makes the necessary changes to their Web site to recognize the Notes browser. Verisign has committed to make those changes in the near future.