I misspoke, you can only change the local admin name in a group policy. You can't change the local admin password. You could however, utilize the AT scheduler and change it that way with a "net user" command. That way you would not have to physically go to each machine.

As for the Cisco IOS, that is the operating system Cisco uses for it's routers and switches. Its all command line based, but some of their switches and PIX firewalls have GUI based administration as well. IOS is Internet Operating System.