Is there more detailed information regarding Fusion Service Accounts for Oracle Fusion Cloud?

I need more detailed information regarding the below fusion accounts, but cannot seem to locate any Oracle documentation detailing what each account is used for. I realize these service accounts perform services in the background of the application, but need some sort of documentation on them from Oracle that provides a complete list of fusion accounts for different modules and the purposes and capabilities of each account.

This is a sample of the fusion accounts that I'm referencing,

FUSION_APPS_APM_BI_APPID
FUSION_APPS_ATK_BI_APPID
FUSION_APPS_ATK_WC_APPID
FUSION_APPS_BIAPPS_SYSTEM_APPID
FUSION_APPS_BPM_MBEAN_APPID