In order to open a project, a callback object must be used.
为了打开一个工程，必须使用回调对象。
Many of the methods provided in RqGuiApp require the use of a callback object.
很多在RqGuiApp中提供的方法需要使用回调对象。
This callback object can then process this response on behalf of the client or hand it over to the client.
然后该回调对象就可以代表客户机处理此响应，或者将其移交给客户机。
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