The document discusses Siebel eScript, a scripting language that can be used in Siebel applications. It provides two types of scripts: server scripts that run on the server and browser scripts that run in the browser. Siebel eScript allows access to system calls through objects and can be used for data validation, user interaction, and integration with external systems. The document provides guidelines and commands for using Siebel eScript and tips for optimizing scripts.