ADDREMOVE_STRING_REMOVEONLY
InstallShield 2024 » InstallScript Language Reference
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This system variable's value is used by the MaintenanceStart function to specify the data in the application uninstallation registry key's UninstallString value, which specifies the behavior of the Remove button (if any) in the application’s Add or Remove Programs entry. For more information on this variable, see MaintenanceStart.
This system variable is initialized to the string value " -removeonly".