If I were to use my brothers ebay & paypal account, set the seller's account up from his computer etc. etc. am I able to check my/his account from my home computer to answer messages to check purchases, etc.?
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What I meant is that you can create the account you mentioned, and use it at home. You can even create it from home. Just be sure you observe all appropriate steps of changing your windows user account, you IP, etc. every time you log into a different ebay or paypal account.