I don't think there is a group policy editor for Home premium... i think its only professional and up.
Best thing to do is: make all computers have static IPs.
Create the Batch file:
shutdownall.bat
=================================
@echooff =
cmd / c shutdown /s /f
\\192.168.2.8 =
cmd / c shutdown /s /f
\\192.168.2.9
cmd / c shutdown /s /f
\\192.168.2.10 =
=================================
Create a batch file like this...
the CMD will execute the command prompt... the /c will carrier out the string and then terrimate
shutdown is the string command, /s will shut the computer down /f will force it to shut down all apps immediately and then the computer name next to it
Edit update:
just that when you create the batch file... don't include all those equal signs...