In Windows, you can change IP address, all in one place. For Solaris, it is slightly different.
IP Address
There are 3 files to configure a hosts IP address. The following is self-explanatory.
/etc/hosts
/etc/netmasks
/etc/defaultrouter
For Solaris 9 and above,
/etc/inet/ipnodes
You can change the ipaddress temporarily by using the ifconfig command
ifconfig hme0 netmask 255.255.255.0
Hostname
You will need to change quite a few files. The first two is the most important
/etc/hosts
/etc/hostname.*
/etc/nodename
/etc/net/ticlts/hosts
/etc/net/ticots/hosts
/etc/net/ticotsord/hosts
/etc/inet/ipnodes