System sends ONE command to the OS. It does not really open a console and play human at it.
you can either do each command in turn with a set of system calls, or you can write a batch file that does them all and call that from your code. Unix lets you put ; between statements to invoke multiple at once, I can't recall if dos does or not, but you can try it
I tried separate statements with ; & && and they are not working how I want. First command open cmd as Administrator, but second and third commands are done in main cmd.