linking C\C++ with VB

Hello,

I want to know how can i link a C or C++ code with a VB code.
To be more clear i want to have my background program on C/C++ and the outlook of the program of VB..
like if i execute my C/C++ code, i want my VB form to get activated n show the result of the C/C++ program... same is for entering any values for the program, a VB form shud get activated n i shud enter the values for that program in the VB form...

It wud be of gr8 help to me if somebody can solve my problem.