How to retrieve filled in data from an Interactive Form?

depends if the interactive form is offline or online (web dynpro)

• Offline :
  • The interactive form is either sent to the user by email, or downloaded by the user from a portal on his laptop
  • So, the user is (usually) not connected to SAP at the time he fills in data using Adobe Reader. Some interaction with the SAP system may still be achieved using Web Services.
  • When he has finished with the Adobe form, he sends it back to the SAP system, or he/any user connects to the SAP system and uploads the adobe form. A Java or ABAP program reads the form and extracts filled in data using Adobe Document Services.
• Online :
  • The user displays and fills the interactive form via a Web Dynpro (which itself may be accessed via a portal or Web Application Server)
  • The Web Dynpro interacts with the Adobe form using the Context nodes and Bindings