すべてのネットワークのViewIDの番号に前置きされる、レベルの接頭辞を設定します
This offers protection to prevent old network updates from straying from into a new level from the previous level. This can be set to any number and then incremented with each new level load. This doesn't add overhead to network traffic but just diminishes the pool of network ViewID numbers a little bit. The Network level loading page has an example of how to use this function.