There are so many versions of OpenAT now, and on each computer you can only have one version installed… We have switched to virtual machines, because we just can’t have so many computers dedicated to development of OpenAT applications!
On one high end computer (2 processors, 1GB main memory) we simulate an entire computer with Microsoft’s “Virtual PC”. It runs Windows XP and just has the SDK from Wavecom installed. We do that for every version we are interested in (takes up 2-3 GB of harddisk space per virtual machine). The best is that you can suspend and resume the machines at a later time - very similar to hibernate, you can continue your work at the same state you have left it - no need to wait for the entire boot up process…).
Virtual PC does give you virtual serial ports which you can map to the real ones on your machine (which could also be usb<->serial converters there). This works pretty good for us with OpenAT so far.
Now you don’t have to switch computers and you don’t need to reboot your ‘real’ computer when you switch the SDK…