In Windows, you can change IP address, all in one place. For Solaris, it is slightly different.
There are 3 files to configure a hosts IP address. The following is self-explanatory.
For Solaris 9 and above,
You can change the ipaddress temporarily by using the ifconfig command
ifconfig hme0 netmask 255.255.255.0
You will need to change quite a few files. The first two is the most important