opening shares with runas

I am logged onto pc1 with an account that does not have permissions to a share on the server computer. How can I access that share using runas command without logging off? It?s a data folder and not an application I am trying to access. Simple plain data folder that only admins have permissions to access. If only applications can be run under runas, is there any other way of accessing network shares under different account without having to logoff and use another account?