Thanks Richard.
They are embedded XP terminals.
So all I have to do is create an ini file like this so all wyse boxes in say classroom1 will default to printer1
room1print.ini
wysenc01=\\server\printer1
wysenc02=\\server\printer1
etc

Then add in the kix script
$sDefaultPrinter=ReadProfileString(@SERVER+"\Netlogon+"\room1print.ini","PRINTER",%CLIENTNAME%)