Use latest Windows (lgpl) online installer and install multiple Qt versions.
After installation from "Start" menu see the added "Qt" entry.
It will contain only one subfolder. E.g. in this case the /5.1.0/MSVC 2012 (64-bit)
The global function is:
createShortcuts = function()
This is used in every installscript.qs for every win/qt component.
You can also see that the "qtenv2.bat" gets generated only for one qt installation (qtenv2.bat generated and created with "AppendFile" operation) so this also points towards the observation that the createShortcuts gets called only for one qt installation