I remember being able to shutdown computers with either ip addresses or like you were doing: network names. the only problems i found were setting domain names and especially that the batch file will have to be launched from an administrative account or with an account with a higher privilege level than the users of the PCs you are trying to shutdown otherwise you get a windows security 'Access is denied' error. i am however no too sure on what switches you should use. try shutdown.exe /? and take it from there.