Another Idea, wich is not so important at the moment:

GSTNet_SendArrayTo(ClientID, .... )

Sending Variables, Arrays and Strings only to a specific client.
(currently and a String message can be send)

This way, the server could choose wich gamedata to send to
wich client.
Especially in a MMORPG, or RPG. The server does not want to send
the same data to every client. (for example, data on visible objects for that player)