using events like«event coVScliI» in .scpt files

Well, I’m going to try and insetad of using an applescript text file for my coding, use a compiled .scpt file, and yes I have done the appropriate terminal command to allow it. I have seen code like this : «event coVScliI» which i think is the same as on clicked and I was wondering what it is for on action? help would be greatly appreciated!

It looks like “on action” is «event coVSactT».