Ok I just got done chatting with Dell Tech support. According to them I do not need the COA (I'm holding onto it anyway) because they are both Dell systems and (I'm assuming) because the GX280 is going to be disposed of (ground up to be exact).  The agent did inform me that making the Studio 540 a dual boot system will void the software warranty, but that's not a concern of mine. I should also point out (per my conversation with Dell) that Dell does not recommend a dual-boot solution.   
I hope I'm in the correct forum for this question.  I have a OptiPlex GX280 that has reached its end-of-life cycle and just picked up a Studio 540 with Vista Home Premium 64 Bit. I've got quite a few titles that will not run on the newer platform. My question is that since the GX280 will be destroyed can I keep the COA and make the Studio 540 a dual-boot configuration? Thanks! Jeremy Crockett
Windows XP / Vista Dual Boot Licensing Question