Code to manipulate files attached in Content Management

Hello everybody,

I am novice in CRM, and I am enhancing a CRM Case:

app component     CRM-BF-COM    

view:                    GS_CM/DocList

attribute:               STRUCT.KW_RELATIVE_URL

object type          CRM_CMG

My assignment is to send the attached files through the methods of an external Web Service,

and the vendor can return them with a digital signature,

so my problem is I don't know the table where the attachments are stored

I have looked in many tables like the ones listed at the end -> http://scn.sap.com/thread/184895

Please help me with an example where I can find and manipulate my attachments. Thank you !