domain and workstation mix envoirment

i have workstation 2003 server which is running oracle apps as well Xp workstation so i want to create domain environment but i don't want to be joining my oracle server which is on 2003 server so how can i manage domain with xp members as well non domain joined 2003 server which is my Oracle servers..but how can they access each other like locally access from domain and access from 2003 server workstation which is non domain member??how 2003 server workstation will access xp nodes wich is on domain ?