InDesign CS4

PDF (adobe.com)

Sharing content between InCopy and InDesign

Working with managed files

Open shared content
Check out content
Opening managed files (InCopy)
Update assignment files (InDesign)
Update content
Accidentally updating your work
Update the InDesign layout
Check in content
Save changes (InDesign)
Save changes (InCopy)

community help (adobe.com)