silent install of Enterprise Server 4.5/4.1?

Someone at my company inquired about running silent installs for enterprise server on W2K systems. I poked around the documentation but it seems like you can only do this for Integration Server 4.6 and that’s on UNIX. Can anyone tell me a little more about these silent installs and whether or not it’s possible to do with Enterprise Server version 4.5.x/4.1.1?