create surface and slab script

I was wondering if the preloaded scripts come with documentation on how to use them. In particular I'm wondering how I used the "Create surface and slab" script that is preinstalled with DS 2.1. I do get a nice cut-away surface with a slab when I run the script, but I can't seem to find information about how I go about changing e.g. the slab thickness, orientation etc.

Thanks!