https://docs.servicenow.com/bundle/tokyo-application-development/page/app-store/dev_portal/API_reference/glideSystemScoped/concept/c_GlideSystemScopedAPI.html

https://www.servicenow.com/community/it-service-management-forum/email-notification/m-p/695221

Catalog Client Scripts and Catalog UI Policies are the client-side scripts that apply to Record Producers.
Catalog Client Scripts allow you to add or modify functionality on a catalog item or record producer form.
Catalog UI Policies dynamically change information on a catalog item or record producer form. UI Scripts, UI Actions, Client Scripts, and UI Policies do not apply to Record Producers. Reference: Catalog client scripts, Catalog UI policies

Application developers configure ServiceNow using industry standard JavaScript to extend and add functionality. JavaScript is a scripting language that enables developers to create dynamic and interactive web pages, as well as manipulate data and logic on the server-side. ServiceNow provides various APIs and frameworks for developers to use JavaScript to customize and enhance the functionality of their applications, such as client scripts, UI policies, business rules, script includes, UI actions, and more. Reference: [ServiceNow Docs - JavaScript in ServiceNow], [ServiceNow Docs - Scripting in ServiceNow]

https://docs.servicenow.com/bundle/paris-servicenow-platform/page/administer/flow-designer/concept/spokes.html A spoke is a scoped application containing Flow Designer content dedicated to a particular application or record type. Flow Designer provides a set of core actions to automate Now Platform® processes. You can add application-specific core actions by activating the associated spoke.