I could type for months about scripts and still only scratch the surface.
The language used is JavaScript which runs in the Chrome V8 JavaScript Engine via Microsoft ClearScript. There are a number of built-in sp. functions, the SystemWindow class, and access to much of the .NET Framework.
See the Script Help window from the script toolbar in StrokesPlus.net for additional details. Post in the forum or join the Discord server for script help from the community.