I have a dual boot system with windows xp and solaris 10 running. Solaris 10 is currently in the primary active partision. If it's possible, how do I make the windows partision the primary active one rather than solaris 10?
If you make XP the primary partition, you'll loose the ability to boot Solaris.
Perhaps you really mean how to have Windows booted by default instead of Solaris. In that case, just edit the GRUB menu.lst file (/boot/grub/menu.lst or /rpool/boot/grub/menu.lst).