> You won't be able to achieve it. Try it and let me know ;-) > > -marc Just between you and me (shhhh) I'm kind of hoping it won't get as far as being asked to make a prototype. It would be really great if what's proposed did actually work, but I can see a whole mess of pain and wasted time in this project. That's why I asked for info about what's likely to happen in practice - the person who asked me to look into it has got all starry-eyed about what might be possible in theory. As Sean has pointed out there are likely to be thermodynamic considerations -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body