[This is preliminary documentation and subject to change.]
The RegisterProduct action registers the product information with the installer. Additionally, it stores the installer database on the local computer.
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The RegisterProduct action uses the ARPNOMODIFY property and the ARPNOREMOVE property. If these properties are set, then the RegisterProduct action will disable Add/Remove Control Panel and Programs Wizard functionality that would modify or remove products.
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The RegisterProduct action is not performed during the AdminInstall.