putting one of my forums in different server


Need a little help. I want one of my folders which has a forum be hosted on different server , I have done that before but forgot
what settings I should change. DNS or some thing

Thanks I do not want to do it with subdomain


I want to do it with folder

Is it now possible?

Set it up on the second server as something like forum.domain.com, then add an A record on the first (main) server which points forum (domain.com) to the second server. I'm pretty sure that would work ok.