Windows Command Line Help

[MisterCornell]

I want to unrar a series of files. When I input the "unrar x filename.rar" command in the windows cmd utility, how do I make that process go into the background so that I can unrar something again without having to open up another instance of cmd?

 

[bsobel]

put 'start' infront of it, as in 'start unrar x filename.rar'