一个外部的UI处理程序允许安装程序制作人员为产品系列向用户呈现单一的，一致的UI。
An external UI handler allows installation developers to present a single, consistent UI for chained products to the user.
嵌入式的UI处理程序允许安装包制作者在分派安装包到标准UI处理程序之前，处理和过滤消息。
Embedded UI handlers allow package developers to still handle and filter messages before they are dispatched to the standard UI handler.
嵌入式的UI处理程序允许安装包制作者在分派安装包到标准UI处理程序之前，处理和过滤消息。
Embedded UI handlers allow package developers to still handle and filter messages before they are dispatched to the standard UI handler.
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