Ms Word & DDE

I want to make DDE Conversation between Delphi 3.0 & Ms Word 7.0. But
everytime I try to make connection (at design time) by marking Ms Word
text as copied object (by clicking Edit-Copy from Ms Word Menu),
TDDEClientConv always fail to detect copied object. It always work well
when I mark Ms Excell Cell. Is there any other step that I have to take
regarding to difference between spreadsheet & word processor ?
Thank you