To use boot manager? Lol
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from what i understand it pretty much uses seperate spots on your sdcard. to appear to be the phones rom. so everything you do install etc is saved. and you can goto another rom (without bcking up nandroiding or anything) and do same stuff than go back to other and everythign is as you left it.
Conap who was the guy i worked with to get the power boost program on my rom did this with gflam.
i see there are some problems here but they seem to be fixing them quickly.
I told gflam soundsed like a support nightmare
But pretty nifty idea.
If you do try it and dont like ti they will refund your money.
Its not something i would use but its a pretty nifty idea. and to make it work is pretty cool.