Before that, let me explain what are servers and clients means. A server is a robot-type program that constantly runs on some computer and exchanges information with users who request it. Clients is users programs that access and exchanges information with servers. Commerce servers are specializes types of Web servers with various commerce related features.
The features are it has support for the Secure Electronic Transaction (SET) protocol. This protocol involves encrypting all communications between the client and the server, thus ensuring that transactions are private and free from outside manipulation. Beside that, it support for specialized types of client and server authentication, such as digital certification which positively ensures both the client and the server of each other's identity.
Other than that, it support for interfacing with "external" programs. This type of support makes it possible for the client to use exchange information with accounting programs and databases that may reside on the server's computer. The examples of external program support include the CGI (Common Gateway Interface), JAVA and ActiveX language. It is also enhanced security features such as multilevel security access and detailed transaction logging and also on-line credit card or bank verification.
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