Hi
At one instant only one level can exist and the codes do not execute further as long as the level is not loaded.So u cannot load another level in the background with the load level instructions/functions.
Another trick could be to make your entire game out of map entities which can be made visible,
invisble using CLIP_RANGE parameter.However beware that map entity does not support a good
lighting and shadows in A5 I think...but in A6
I guess its cooler
zazang