S4S: How does it work?

S4S uses a single license to access the Salesforce API and then caches the collected data for use with a .NET application. The S4S connector is essentially a wrapper for the Salesforce API with a number of additional features to facilitate the rapid development of Salesforce application. 

  

Sitecore for Salesforce Data Connector (DC)

The following diagram shows how S4S coexists with Sitecore on the web server. Note the use of the Salesforce Partner API to expose both standard and customs objects in your Salesforce instance.

  

Sitecore for Salesforce Security Connector (SC)

The Security Connector uses the Data Connector to make Salesforce Contacts visible to Sitecore at login time.