The textbox document contains all of the content in the textboxes whose anchors are in the Main Document. It begins at the CP immediately following the Endnote Document and is FibRgLw97.ccpTxbx characters long.
The locations of individual textboxes within the textbox document are specified by a PlcftxbxTxt whose location is specified by the fcPlcftxbxTxt member of the FibRgFcLcb97. The locations of the textbox anchors in the Main Document are specified by a plcfSpa whose location is specified by the fcPlcSpaMom member of the FibRgFcLcb97.
Not all members of a plcfSpa specify the location of a textbox. The lid member of the FTXBXS structure specifies the relationship between shape anchors and textbox anchors.