Technical Details on Server Gated Cryptography Describes the difference between the SGC protocol and SSL/TLS. Also covers the implementation of SGC in Netscape products. (Microsoft) http://www.microsoft.com/security/tech/sgc/TechnicalDetails.asp

SSLWrap An inetd service (for Unix operating systems) that sits over POP3, IMAP, and SMTP, and encrypts data using SSL. http://www.quiltaholic.com/rickk/sslwrap/