# Concepts

Source: https://libtmux.org/en/fsharp/latest/concepts/

> Understand F# handles, filters, transports and layout ownership.

Use these concepts to reason about F# handles, selection and command execution. Each page includes complete programs with imports, project files, run commands and cleanup.

For individual types and operations, open the [API reference](https://libtmux.org/en/fsharp/latest/reference/). For a first connection, start with [attaching to tmux](https://libtmux.org/en/fsharp/latest/guides/attaching-to-tmux/).

- [Server, session, window, pane](https://libtmux.org/en/fsharp/latest/concepts/server-session-window-pane/): Navigate captured sessions, windows, and panes, and refresh their state.
- [Filtering and queries](https://libtmux.org/en/fsharp/latest/concepts/queries/): Combine predicates, handle result counts, and match related windows.
- [Commands and control mode](https://libtmux.org/en/fsharp/latest/concepts/transports/): Run bounded commands and manage a persistent control client.
- [Layouts and repeated setup](https://libtmux.org/en/fsharp/latest/concepts/workspaces/): Create a split window and reuse a named window safely.