A delta product is a complete product that requires one or several previously packaged products to be already installed on the target computer. A delta product always has a different name than the products it depends on.
For example, suppose you want to package an emulation program that can be installed on the Packaging Computer only if an SNA layer program has already been installed. However, you do not want to package and distribute the SNA layer together with the emulation program, because you want to be able to update each product independently.
In this case, you are creating a delta product for the emulation program. First you install the SNA layer program. Then you choose the delta mode. The Packager for Windows records only the changes from the emulation program into the emulation product, and not the changes from the SNA layer program.
If the prerequisite product has not been installed on the target computer when the Installer attempts to install the delta product, the Installer cancels the installation of the delta product and displays an error message.
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