The Qlikview Desktop Client / IE-Plugin Settings.ini
Standard Path: %appdata%\QlikTech\QlikView\ (C:\Users\USERNAME\AppData\Roaming\QlikTech\QlikView).
Please note that this is a Windows-user-specific path. This is the setting file shared by both QlikView Desktop (qv.exe) and the IE-plugin. It is used to store settings that concern client-side visualizations, engine behaviour, logging, reloads (qv.exe only), license and other aspects.
The QlikView Server (QVS) Settings.ini
Standard Path:C:\ProgramData\QlikTech\QlikViewServer on each cluster node
This is the setting file used by the QVS service for the server engine behaviour, logging, for visualizations and other QVS-related aspect.
The QlikView Batch (qvb.exe) Settings.ini
This is the file using by the QVB, the non-graphical version of the client which is used to perform reloads by the QlikView Distribution Service (QDS). It is used to store settings about reloads and their logging. Since it is used for reload-only purposes, it doesn't contain information about graphical rendering or license settings, and it's therefore usually a lot simpler than the other two settings.ini files.