In my system, I have 2 GPUs.
If I want to run two instances of the GPU miner, can I use the same folder? or do I need to create a separate folder for each instance?
Also, where are the temporary files kept? I mean, if I close the miner occasionally, I am sure the miner keeps a copy of the unfinished work somewhere.

I'd like to have someone confirm that I can run multiple instances in separate folders... I don't see why I wouldn't be able to, but haven't been able to find any specific documentation on it.

eg. I'd like to run:

bitcoin.exe -datadir=c:\abc
bitcoin.exe -datadir=e:\xyz

Then make transactions between the two instances on the same PC.