Hi,
If u just want to change it temporarily then type the command:
hostname <newname>
However if u want to change it permanently then replace old hostname with new one in /etc/hosts,etc/hostname.<interface>,/etc/nodename files.
After that reboot the system.
To see processor info type the command:
/usr/sbin/psrinfo -v
and to see bios version type the command:
/usr/platform/`uname -i`/sbin/prtdiag -v
I hope this helps......