Executing command without flashing shell window

[Attila <ejjeliorjarat@...>]

Hello!
I want to execute a command to get the label of a hard disk by VOL C:. The  
only problem that os.execute() flashes the black shell window, and I don't  
like this. I guess it's possible without it, but don't know, how. I also  
have ntlua library, but ntlua.start("cmd /C VOL C:") flashes the screen as  
well. Also tried to play with io.popen, but the result was the same. I  
hope somebody can help me to figure it out.
Thanks:
Attila