do we need to include the refered dlls in InstallShield project when they already exi

[tutus]

Hi,
1/ If I am trying to deploy an application on a server. The application uses a business dll for example. But the dll has already been installed as part of another application on another server. Do I still need to include the dll in my current InstallShield project.

2/ re you aware of any Install shield forums pls

Thank you.