# libtmux::Window::session_id

- **Module:** libtmux::Window
- **Package:** libtmux-cxx
- **Language:** C++
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-cxx/blob/393d4b0ad666f18a6581f1eb281741a75a7503f0/include/libtmux/entities.hpp#L510
- **Page:** https://libtmux.org/en/cxx/latest/reference/libtmux-window-session_id-2uq6/

```
libtmux::Window::session_id() -> SessionId
```

The link to the parent, carried in the row so traversal upward costs nothing until the parent itself is wanted.