这些产品分为两大类：ISAPI过滤器和外部设备。
They fall into two categories: ISAPI filters and external devices.
客户机设备向门户发出请求，门户过滤器(Portal Filter)接收该请求。
The client device makes a request to the portal, which the portal Filter receives.
该过滤器就会被加密，通过云发送到她儿子的设备中。
The filter is encrypted and sent via the cloud to her son's device.
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