Under ideal circumstances, all InDesign and InCopy users on the team have access to a server where assignment files are stored. However, if one or more users don’t have access to a common server, you can create and distribute compressed assignment packages. After working on the assignment, the InCopy user repackages the assignment and returns it to be integrated into the InDesign document. Package files created in InDesign include the .icap extension. The return package files created in InCopy include the .idap extension.
There are two commands for packaging files: Package For InCopy and Package And Email. Use Package For InCopy to create a compressed package that you can distribute manually; use Package And Email to create a compressed package that is attached automatically to an e-mail message.