Change Computername or Workgroup
This article shows you how to use the XP support tool, NETDOM.exe to change a computer name.

NETDOM.exe which can be downloaded from Microsoft or copied from the installation disk is part of the support tools for Windows XP. It can do many network related action, of which one of them is to change the name of a computer

NETDOM.exe renamecomputer [oldname] /newname:[newname]

i.e. netdom renamecomputer gandalf /newname:frodo

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