We are using RFA 8.1 C++ api with Open-DACS api to check user authorization. We want to understand DACS user configuration. Is it true that when user is created in DACS system, we mark it as display[GUI] or server user? Recently we came across a situation where a server user that is used to connect to TREP by our feed handler, when same user is used for logging in to DACS then we need to provide server app id. Display app id didn't work. So is it safe to assume that DACS users should be logged in with specific app id[server or display] based on if user is configured as server or display user in DACS system?