I think Windows API is declared in window.h， which is basic API. Other Library surporting multithread like MFC is build on WINDOWS API. I don't know if I express clearly. I 'm from China.

This is a problem aout "Communication among process". You can solve it by using "singal, mutex,memory share ect"

You can initial every element to 0 as followed: vector<int> nJingle(8,0;//There are 8 element in this vector obj and every member's value is initialed to zero.

You must give a initialed num for a vect obj.
For example:
vector<int> nJingle(8);//right
vector<int> nJingle;/erro