roModel
From SAP Enable Now Wiki
Scope
Web Assistant parameter, specified either in the URL or in the Web Assistant parameters in the linked application.
Purpose
Not entirely sure. The only documentation I can find on it is that it should be set to "UACP or WPB depending on EXT mode", which doesn't exactly clear things up. (If you know, please email me.)
Usage
Specified as:
roModel=[null|UACP|WPB]