Under Windows XP, is it possible to change the computer name without rebooting? If so, how?
I don't believe it is possible. Even Windows 7 still requests a reboot when changing the computer name.
You can say restart later when you change it but I have a feeling the machine will still identify itself as the old name until the next reboot(?).
It's not possible to do it in 100%, but there's a hackway for doing it partially.
This trick changes some registry keys to achieve it.
If you change computer name, new name is stored in registry and is applied on next reboot.
So the only real way is rebooting.