How to use 2 command in sytem() function ?

[mmc01]

I want to run Unhidden.exe in drive N: and send char to that program. I use function like this

system("N:/Unhidden.exe");

it can open Unhidden.exe but it run in visual studio 2010\Projects\ . I try to use command N: and Unhidden.exe in cmd it can run in drive N: . So I try to use function like this

system("N:");
system("Unhidden.exe");

but it not found Unhidden.exe . How to use 2 command in sytem() function ?