displaying random scenes etc

[cl113]

i am a beginner and i am terrible at programming and am quite confused.

1. is there any way, after creating multiple scenes, that one can randomly select which scene to display using vizact.choice or something else?

2. does vizact.choice randomly choose from a list and then stop when all the list items have been chosen, or does it continue to choose from the list?

3. also, is there a specific command that allows you to reflect an object's position about a specific axis?

the online reference is not helping and any help would be much appreciated!!!!!!!!