command message

基本解释

If the user chooses a command, that command message will be sent to the window whose handle was passed.
如果用户选择命令，该命令消息将发送到句柄被传递的窗口。
The EN_KILLFOCUS notification message is sent when an edit control loses the keyboard focus. The parent window of the edit control receives this notification message through a WM_COMMAND message.
当编辑框丢失键盘焦点时（也就是没有光标在编辑框内闪烁时），父窗口会收到这一消息。
The EN_SETFOCUS notification message is sent when an edit control receives the keyboard focus. The parent window of the edit control receives this notification message through a WM_COMMAND message.
当编辑框获得键盘焦点时（即编辑框由无光标变成有光标在闪烁时），父窗口收到这一消息。

So generally, if you don't get an error message in a command line environment like this, that's good.
一般来说，如果你在命令行界面,没有收到错误信息，那就是好消息。
哈佛公开课 - 计算机科学课程节选

When an incoming call or message arrives, it can be received via voice command without even touching the phone.
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As the target is reading the message, malicious software they had inadvertently installed would report back to a command-and-control server, before collecting information from the phone.
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