Solaris Install over WAN(where to keep wanboot.conf file for DHCP client)

I am trying to configure my jumpstart server to install Solaris 10 on a T1000 machine(target) over WAN. I do not know the IP address of the client, i wish the client to get the IP address from DHCP.

how do i configure my /etc/netboot hierarchy. One option would be to keep the wanboot.conf in /etc/netboot folder, but i dont want to keep it global.
I do not know the IP address of the client, ( or the network address), i know the MAC address of the machine.
Is there a way out to still keep wanboot.conf for that specific client, without making it global ??

Solaris 10