How does multiple active service accounts work?

[AttacKat]

Create separate SE accts, with each having its own KEY entered for the FFVIX service.

SEAcct1 <-> FFXIV <-> KEY1 (Play on PC)
SEAcct2 <-> FFXIV <-> KEY2 (Play on PC)
SEAcct3 <-> FFXIV <-> KEY3 (PS3)

Now you can play three chars at the same time in game.

If you use one SE acct for all three keys, you can only play one char at a time.

jc