When the source code for the calling executable is compiled or assembled, the DLL function call generates an externalfunctionreference in the object code.
DLL 函式呼叫会在编译或组译呼叫可执行档的原始程式码时，在物件程式码产生外部函式参考。
2
In Listing 2 a circular reference is created by calling the externalfunction myFunction.
在清单2中，通过调用外部函数myfunction创建循环引用。
3
In this case, there is an externalreference to the nested function, and the nested function retains its reference to the call object of the outer function.