# callAsFunction(id:value:) Pushes a window defined by the window group that presents the specified value type and that is associated with the specified identifier. ``` @MainActor func callAsFunction(id: String, value: D) where D : Decodable, D : Encodable, D : Hashable ``` ## Parameters `id` The identifier of the scene to present. `value` The value to present. ## Discussion Don’t call this method directly. SwiftUI calls it when you call the [`pushWindow`](/documentation/SwiftUI/EnvironmentValues/pushWindow) action with an identifier and a value: ``` pushWindow(id: "viewer", value: video.id) ``` For information about how Swift uses the `callAsFunction()` method to simplify call site syntax, see [Methods with Special Names](https://docs.swift.org/swift-book/ReferenceManual/Declarations.html#ID622) in *The Swift Programming Language*. --- 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)