Discovering aliases and synonyms

My Oracle to SQL Server 2008 migration is going well and is close to wrapping up. In an effort to make the transition as seamless as possible for the users, I wondered what kind of options were available to me to reuse the known name of the Oracle server, once it’s been taken offline. There has already been a DNS alias set up to obscure the actual name of the SQL Server, but the instance name still has to be added. Our SQL Servers are all named instances; can I refer to a named instance as DBPROD instead of PRDDB\PRD1?