none it seems? maybe some in-game use or some reward for bringing X people
what's the hard thing here? just add another field in your account creation and another in account database, and when you register the account, save that field on the database..
its basically just copy-paste the already existing code and changing the names -.-'
gosh, how I hate how low OT has gone, 2 years ago before I left, people would freely give all their code away with a smile on their face, look at what's happening now, a measly 4-5 lines of code being sold...
*sad*