Objects that are loaded inside of this level will not be garbage collected when the main level is destroyed. Be very careful with this, however. If your persistent object references other objects in the main level, those objects will not be garbage collected. This can lead to very subtle and dangerous bugs. Package flags for package control.
Every package has a set of three flags that can be controlled by a mod author.
In order to set these flags, you need to be using 'ucc make' to compile your package. When you rebuild your package, the settings you give each of these flags will be saved. AllowDownload will send your package to clients that connect to a server with that package set as a ServerPackage. ClientOptional means that the client doesn't have to have the package in order to connect to the server. A client optional package can be skipped during auto download and the client will still be allowed to connect.