What Makes A Good Commerce Servers ?

From my very own understanding , commerce servers are specialized Web servers that runs some of the main functions of online market and also include features for online market such as 'Ebay.com' , 'lelong.com.my' , 'mudah.my' in web . But the exact definition is commerce servers are specialized types of Web servers with various commerce-related features . 

Do you know what makes a good commerce server ? Basically , commerce server should some special features as below :

1. Must 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 . 
2. Support for specialized types of client and server authentication , such as digital certificates , which positively ensures both the client and the server of each other's identity .
3. Support for interfacing with 'external' programs . This type of support makes it possible fir the client to use exchange information with accounting programs and databases that may reside on the server's computer . Examples of external program support include the CGI (Common Gateway Interface) , JAVA , and ActiveX languages . CGI is a means for the client to run programs on the server system , On the other hand , JAVA is more sophisticated and allows the server to pass programs to the client for execution on the client machine . 
4. Enhanced security features such as multilevel security access and detailed transaction logging .
5. On-line credit card or bank verification .

So , to be conclude , there are many of the types of commerce server out there . But make sure that you are aware with the features included so that you will have more benefit . Pick one that you think suits you the best for the web you are up to :)