A COM client interacts with a COM object by acquiring a pointer to one of the object's interfaces and invoking methods through that pointer, as if the object resides in the client's address space.
COM的客户程序通过获取指向一个对象接口的一个指针，并通过该指针来调用方法以实现与COM对象之间的互相作用，就好像对象驻留在客户程序的地址空间中一样。
To add an item to the tree, simply call AddItem and give it a pointer to the type of object being stored.
要向这棵树添加一个子项，可以简单的调用AddItem并传一个指针给它，用来存放添加后的对象。
If you move the mouse to the right side of the object, the mouse pointer changes, indicating that you can click to connect the element.
如果将鼠标移动到该对象的右侧，鼠标指针将改变，表示您可以单击以连接该元素。
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