There's a flag used by EnterpriseOne that dictates if the application can be run as web client or windows-mode (fat client).
The field used is SIANSIF in table OL812.F9860 (Object Librarian Master Table).
It has the following settings used:
blank - both Web and (fat) Client
W - Web only
C - (fat) Client only
R - ???
Notes:
- This is an undocumented setting in EnterpriseOne and changes are unsupported by Oracle.