There are 770 functions in the VBS files in $XSI_HOME\Application\DSScripts. Here’s a word cloud of the function names. To create the word cloud, I took the camel-case names like SetCameraSequencerLayoutProc and split them into Set, Camera, Sequencer, Layout, and Proc.
Proc indicates a function that is the implementation of a command. So the command SetCameraSequencerLayout would ultimately end up running SetCameraSequencerLayoutProc. So you see a lot of commands are actually implemented in VBS 
