Can I use Winminer (the same account) on multiple PC's.
Say for example my Brother (who lives in a different country) wanted to help me mine.
Is that allowed?
I don't see why not, if your brother enters your e-mail address into the miner, it'll mine for you. If he doesn't have your password, he can't see the balance or do much else except mine for you.
Now if you give him your username and your password, (not recommended) then he could see your balance and make his own withdrawals if he wanted.
This is how I see it, but could do with the devs confirming it as I wouldn't want to break any terms of service.