Merge Modules are essentially installer sub-projects that can be created
independently of one another and later merged together. A Merge Module is a
reusable collection of installation functionality. A Merge Module is just like an
installer, complete with features, components, panels, actions, and files. However, a
Merge Module cannot be installed without being part of an InstallAnywhere project;
instead use Merge Modules to include the functionality of one installer within another
installer.