Finally, there is an official Windows emulator for the HP39gII (there was an unofficial one before - you might have seen it in these pages). You can download it by clicking in the link below
HP39GII Calculator Emulator - Windows
I am running it in my Mac in the Parallels Windows session - and works flawlessly!
You can see the different skins - some of them are very nice - in particular the bigger one, that happens to be landscape:
The quality of the picture is excellent!
Now, for the biggest of them all, in landscape format:
And now the compact one, that comes as default:
This occupies a small spot even in my puny MacBook air. With Parallels in coherence mode, I can call it as a Mac application all the way.