Assuming one has 2 identical machines (one for trading and one for back up) and can only find one copy of Windows XP pro, can one: 1. Install the same XP pro on both machines ( and keep looking for that the original copy which is somewhere in the basement - somewhere being the operative word here). 2. Will one be able to do windows updates on the second machine? 3. What are the advantages/disadvantages of going that way? 4. Would Microsoft be really upset if one were to complete such an operation? 5. Should I just devote 1 contract and its 3 point profit to get the extra $150 and buy the damn OS. I have already wasted 2 hours looking for it and still ..... no cigar. After my disaster with OEC on Friday, I have decided to build a fence around my trading. Therefore, I am thinking of having a second back up system in case brokerage disaster strikes. I already have one system which consists of a laptop + a desktop, and the second system will include 2 PCs. Both systems will be used exclusively for trading. Both will have my charting software and access to 2 different accounts with different brokers naturally.