Foundation OE (FOE) Designed for the demands of Web servers, content servers, and front-end servers, this OE includes applications such as HP-UX Web Server Suite, Java™, and Mozilla Application Suite. This OE is bundled as HPUX11i-OE. 

Enterprise OE (EOE) Designed for database application servers and logic servers, this OE contains the HP-UX 11i v3 Foundation OE bundles and additional applications such as GlancePlus Pak to enable an enterprise-level server. This OE is bundled as HPUX11i-OE-Ent. 

Mission Critical OE (MCOE) Designed for the application servers and database servers, this OE contains the Enterprise OE bundles, plus applications such as HP Serviceguard and Workload Manager to enable a mission-critical server. This OE is bundled as HPUX11i-OE-MC. 

Technical Computing OE (TCOE) Designed for server applications, this OE contains extensive graphics applications and Math Libraries. This OE is bundled as HPUX11i-TCOE. https://docstore.mik.ua/manuals/hp-ux/en/5992-3364/ch01s02.html







With 11i, HP bundled the release into what the call "Operating Environments". You can still order a base OE and add on whatever optional software you want, but HP packages these offerings together for "technical servers and workstations":

11i Minimal Technical Operating Environment
(the base package)

11i Technical Computing Operating Environment
(adds on Apache, CIFS/9000, FirstSpace, Java, MLIB, MPI, PAM Kerberos, and Visualize Conference, on top of what is already included in the MTOE)


and for "commercial servers":

11i Operating Environment
(the base package)

11i Enterprise Operating Environmnet
(adds on EMS HA Monitors, MirrorDisk/UX, OnlineJFS, OVGlancePlusPak, and PRM on top of what is already included in the OE)

11i Mission Critical Operating Environment
(adds on ECM Toolkit, MCServiceGuard, ServiceGuardNFS, and Workload Manager, on top of what is already included in the OE, and EOE)

The document I referred to for this info is from June 2001, so the packages may have changed since then, but this covers the basic idea.