Could you please tell me where I can find the configuration settings after installation, both on Mac and Windows. I have tried to look for .ini files, but couldn't find them.
Reading the manuals at http://www.safeexambrowser.org helps:
SEB preferences are saved according to Mac OS X standards in the user's Library/Preferences/ directory. The file named org.safeexambrowser.Safe-Exam-Browser.plist is generated after you start SEB the first time, open preferences and save them. You can deploy this file to the user's Library/Preferences/ directories on other computers (for example in a computer room in a university or school) to get them opening the same Start URL and using the same passwords. Or use the write settings to app bundle option to create a pre-configured copy of SEB (this feature is not available on the App Store version of SEB for Mac OS X).
For Windows 7, it is in the ProgramData directory. See
where you can also see it for Windows XP.