[zokemon]

Player is actually a built-in TServerPlayer (or specifically a TPlayer if you are talking about the client) and with almost all objects, you can give it custom variables. I think that is how GK's mud system work or at least partially, it syncs mud data from the server to the client and stores both on the server side and client side TServerPlayer objects. I'm only concluding this from pure guessing though and my work on GK has no influence on my guess.