I have a machine with 3 instances of sql 2000, one instance is default while other named isntance. I run serverproperty command with diff. parameter that gives me the report that only default sql instance is having sp4 while other 2 named instances shows RTM (Release To Manufacturing). What i am considering that named instances are not upgraded to sp4, what do u suggest me do I install sp4 to each instance of sql ? Explain a bit about RTM ?