Optionally, it will take a reference UUID (when the comment is a reply to another one) and a user name (when the comment is not anonymous).

可选地，它将使用一个引用uuid(如果评论是另一个评论的回复的话)和一个用户名(如果评论不是匿名的话)。

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Show when a user is typing: Alert the server when a user has started to type, so that other participants can see that a reply is pending.

显示用户输入时间：用户开始输入的时候通知服务器，会谈的其他人可以看到有人在回复。

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For example, in some countries, if a user does not reply to the opt-in request, he can be regarded as silently accepting the opt-in request.

例如，在某些国家，如果用户未回复opt - in请求，可以认为其默认接受opt - in请求。

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As Apple is using the reply-to address of a message's User Data Header to identify the origin rather than the raw source, receiving iPhone owners risk being fooled by a phishing attack (or just a dishonest acquaintance) that poses as a contact or a company.

ENGADGET: iPhone reportedly vulnerable to text message spoofing flaw

If the user enters a phone number, he or she receives a text message asking for a reply with a registration code.

FORBES: New Mac Malware Scams Users Into Signing Up For Cellphone Charges