Choose the serial line protocol offered by the server you are calling.

选择您呼叫的服务器提供的串行线路协议。

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"Prince Harry has been on a private holiday before he resumes his military duties, " said a palace official, declining to be named in line with protocol.

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Similarly, Facebook and Twitter send login credentials over a secure line and then revert to an unsecure protocol. (Users of those social networks can add an "s" after "http" to force the systems to encrypt their browsing.) Social networking sites are where people increasingly conduct private conversations, whether through Facebook's Messages or Twitter's Direct Message feature.

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It's palm-sized with a single blue LED light indicating a connection, but honestly you don't ever need to look at it: it doesn't need line-of-sight to your handset because it uses a wireless protocol called WiFi Display, which means you can happily leave it dangling out of the way behind your TV.

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