Adobe InDesign CS3 - Manual (Page 611)

INDESIGN CS3
User Guide
604
Open linked InCopy files exported from InDesign
In certain workflows, InDesign users might export text and graphics as separate files, rather than wrapping them
inside an assignment file. Exporting separate files is useful if you work on unrelated graphics or bodies of text.
However, InCopy users aren’t able to see how the content fits within the InDesign layout.
InDesign document (.indd) with three linked but unassigned content files (.incx) opened in InCopy
Open InDesign documents that have linked InCopy files
To see all page items in the context of an entire layout, InCopy users can open and edit an InDesign document in
InCopy. This approach can be useful for editing and copyfitting if seeing the overall layout is important, or for editing
most of the stories in a document rather than a few. After the InCopy user edits the stories, the InDesign user can
then update the links to the modified files. If the InDesign user changes the layout, the InCopy user is notified when
the InDesign document is saved.