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The browser maintains a single open connection to Amazon's servers, ready to request more content when needed.

浏览器保持与Amazon服务器的单一打开连接，随时准备请求更多内容。

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In normal operation, the remote client responds with an ack packet that moves the half-open connection to fully open.

在正常操作中，远程客户机用一个ACK数据包进行响应，这会使半开的连接转换为全开的。

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In its latest operating system update, Apple introduced iMessage, which allows iPhone, iPad, and iPod touch users to send each other unlimited text messages using Wi-Fi or 3G connections (in other words, in the worst case arbitraging the data plan and in the best, using an open backhaul connection for free).

FORBES: The Fall Of The Texting Empire

Silk keeps a persistent connection open to EC2 so that there is always a connection at the ready to start loading the next page.

ENGADGET: Amazon Silk browser spins a faster mobile web, courtesy of cloud servers (video)

One scenario is if a person doesn't encrypt their wireless connection, leaving it open to a neighbor or malicious hacker that swaps illegal files.

NPR: Music, Movie Industry To Warn Copyright Infringers