There are 2 routes:
COM - The documentation is old but still valid - check Support site for 4 series Object references.  YOu will need to write a wrapper for this.
Web API - No full documentation, but log in as admin to the web client and review the options on the admin menu.  You can use the method calls to enable the functionality - you will have to write your own forms.  Data sent and retrieved using XML.  Be vary of directpage and method calls - cannot control the interface to sufficient levels needed