Similar to an actor's Role property, the NetMode property of the level indicates what type of network game or standalone game is being played. It will be different on clients and servers though other parts of the levelinfo should be the same. The options are NM_Standalone, (a botmatch or single player game) NM_DedicatedServer, (a dedicated server) NM_ListenServer, (a non-dedicated server (ie the Host Multiplayer Game in the menu) ) and NM_Client. (a network client) These can be checked within functions or within the replication block to do specific things under various circumstances. This is most commonly used to differentiate whether an object with ROLE_Authority is in a botmatch/listen server or a dedicated server.