Putting in cmd lines?

Hi,

How can I put command lines into my program which you would normally put in the C:\\Windows\System32\cmd.exe program...lines like..."dxdiag" etc?

I want my program to be able to run lines like that. How does it work?

Regards,
Chris

EDIT: in C++

Well, one way is using the system() call. Like you can do:
system("dxdiag");

ah cool thanks a lot