mui.IsVersion4 -- check if MUI 4 or better is installed (V1.2)
r = mui.IsVersion4()
This function can be used to check whether the user is running MUI 4.0 and up.
As some features of MUI Royale are only available on MUI 4, it might be necessary
to use this function to check whether they are available before you try to use
True if MUI 4 or better is available