Member ClientInfo::obsolete1: This field is no longer used and should be set to 0
Member kHeartBeatsUntilDeath: Since protocol version 1.3, replaced by keep-alive mechanism
Member kHeartRate: Since protocol version 1.3, replaced by keep-alive mechanism
Member kMsgDDragInfo: File drag and drop is no longer implemented.
Member kMsgDFileTransfer: File drag and drop is no longer implemented.
Member kMsgDKeyDown1_0: Use kMsgDKeyDown for protocol version 1.1+
Member kMsgDKeyRepeat1_0: Use kMsgDKeyRepeat for protocol version 1.1+
Member kMsgDKeyUp1_0: Use kMsgDKeyUp for protocol version 1.1+
Member kMsgDMouseWheel1_0: Use kMsgDMouseWheel for protocol version 1.3+