# `wezterm.mux.get_window(WINDOW_ID)`

*Since: 20220624-141144-bd1b7c5d*

Given a window ID, verifies that the ID is a valid window known to the mux
and returns a [MuxWindow](../mux-window/index.md) object that can be used to
operate on the window.

This is useful for situations where you have obtained a window id from
some other source and want to use the various `MuxWindow` methods with it.