Map, LocalMap, TransitionMap, what's the difference?

[twoflyingpigs]

In baseengine.ini, defaultengine.ini, there's a [URL] section,

[URL]
Map=UTFrontEnd.udk
LocalMap=UTFrontEnd.udk
TransitionMap=EnvyEntry.udk

In udn, I find some description about Map and LocalMap:
Map (The default map, serves as meta map)
LocalMap (Default to open when the client is started)

What exactly "meta map" means?
And what's the "TransitionMap"?

[RobyLP]

Bump to this old thread, some light here would help.

[TheAgent]

Transition map is the temp map loaded, to render the Loading screen then it loads the real map.

Map is the First map loaded for the menu

Local map.. no clue, just needs to be the same as the main menu map.