# receiversSpecifier Sets the object specifier to `receiversSpec` that, when evaluated, indicates the receiver or receivers of the command. ``` var receiversSpecifier: NSScriptObjectSpecifier? { get set } ``` ## Discussion If you create a subclass of `NSScriptCommand`, you don’t necessarily need to override this method, though some of Cocoa’s subclasses do. An override should perform the same function as the superclass method, with a critical difference: it causes the container specifier part of the passed-in object specifier to become the receiver specifier of the command, and the key part of the passed-in object specifier to become the key specifier. In an override, for example, if `receiversRef` is a specifier for `the third rectangle of the first document`, the receiver specifier is `the first document` while the key specifier is `the third rectangle`. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)