Account sharing is a violation of the ToS and can get the account permanently banned. Everyone must have their own account to play. There is no other (legal) way to do this. This is what everyone agrees to when they create the account. You cannot log into the same account from more than one computer at a time. The second login would disconnect the first.
"Everyone's got one. Better to be a smart one than a dumb one." - me
"It's people like you that [I]think[/I] you know everything that give those of us that [I]do[/I] a bad name." - me
"Eat, drink, and be Merry, 'cause Pippin was a fool of a Took."