well as it's on the same server, i would imagine you just need a SE account and the game on the platform you want.
i might be wrong, but as PS3 players and PC players will be grouping along side each other i don't see any reason why you couldn't and even if you do need a new account there will probably be a option (eventually) to swap..
so yeah, I think just the one SE account + game on the platform you want should be all that is needed.. though would you really wanna fork out £ - XX then £ - XX again?
if it is the controller style of play that you are after then you can play the PC version with an Xbox controller and i have read there are ways to get the PS3 controller up and running as well (though this way requires a little more effort, but only downloading drivers).
IF it is the whole running it on a bigger screen issue (generally TV's are bigger), then you can get a lead to wire up the PC to the TV.
So basically it is possible to play with a Controller on a TV through your computer.
it all depends on what you want. to make it feel like a console (controller, TV, etc) will be a much cheaper route then buying the game again for the PS3 + you know you wont need to start again (ofc this is assuming ---- You have a computer capable of running FF XIV), but it will mean some effort (unless ofc you have an xbox controller - which is meant to be plug in and your off (according to some people i have been talking to, though they say this is with the WIRED Xbox 360 controller).
as i assume you have a PS3 controller and TV
reguarding the PS3 controller, if you want it to be wireless you will need a bluetooth reciever usb...
end of the day your choice , but just thought i would let you know it is entirly possible to play with a controller and on the TV, with your computer..
sorry for rambling..
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