I am bit unsure of what you mean of the PCD Structure.
If you are in the menu content administration->Portal content , you will see the id in the quick info iview (after you select an element).
If you edit the iview or element, I belive the id is in the PCD Location property
Ref: http://help.sap.com/saphelp_ep60sp2/helpdata/en/38/
1fff061b8d476a981c14ad669af7c1/frameset.htm
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