# API reference Source: https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/ > Types, methods, and functions in libtmux for Ruby. Browse the Ruby types and operations for working with tmux. Start with the core objects below, or search for a type or member. Server 1 type [Server](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-server/) class 40 members Connects to an existing endpoint. Closing retires clients, never the daemon. Session 2 types [Session](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-session-nvps/) class 21 members [SessionWhere](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-sessionwhere/) module 1 member Window 4 types [Window](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-window-1vfx/) class 18 members [WindowLink](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-windowlink-tusj/) class 19 members [WindowLinkWhere](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-windowlinkwhere/) module 1 member [WindowWhere](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-windowwhere/) module 1 member Pane 2 types [Pane](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-pane-14z6/) class 27 members [PaneWhere](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-panewhere/) module 1 member Client 1 type [ClientWhere](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-clientwhere/) module 1 member Hooks 1 type [Hooks](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-hooks/) class 5 members Hook values are executable tmux command strings, never literal data. Options 1 type [OptionValue](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-optionvalue/) class 7 members Raw bytes remain available even when a caller requests a typed conversion. Commands 3 types [Cancellation](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-cancellation/) class 5 members [CreationReceipt](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-creationreceipt/) class 5 members IDs printed by the creation command itself, before later topology changes. A receipt proves creation, not continued ownership or current membership. [Endpoint](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-endpoint-s6cs/) class 8 members Explicit executable and socket selection. Construction starts no clients. Control mode 4 types [ControlConnection](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-controlconnection/) class 15 members [ControlSubscription](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-controlsubscription/) class 8 members [GuardedBlock](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-guardedblock/) class 8 members [GuardedReply](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-guardedreply/) class 7 members Blocks observed between private boundaries may include hooks. They do not establish command ownership, final status, or completion of delayed effects. Queries — Expressions 1 type [FilterExpr](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-filterexpr-1wz0/) class 13 members A schema-validated predicate over captured records; evaluation performs no I/O. Snapshots 8 types [CapturedRecord](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-capturedrecord-18ay/) class 7 members [ClientSnapshot](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-clientsnapshot-w08e/) class 21 members [PaneSnapshot](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-panesnapshot-43mz/) class 22 members [Selection](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-selection/) class 14 members Replayable captured membership. Snapshot construction owns record values. [SessionSnapshot](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-sessionsnapshot-xllu/) class 16 members [Snapshot](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-snapshot/) class 14 members A validated graph observed over an interval, with no transport reference. [WindowLinkSnapshot](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-windowlinksnapshot-vzc2/) class 14 members [WindowSnapshot](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-windowsnapshot-19c3/) class 16 members Errors 18 types [Cancelled](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-cancelled/) class 8 members [CapacityError](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-capacityerror/) class 8 members [ClosedError](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-closederror/) class 8 members [CommandError](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-commanderror/) class 9 members [DeadlineExceeded](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-deadlineexceeded/) class 8 members [Error](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-error/) class 8 members [FieldDecodeError](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-fielddecodeerror/) class 8 members [IncompleteSnapshotError](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-incompletesnapshoterror/) class 8 members [InconsistentSnapshotError](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-inconsistentsnapshoterror/) class 8 members [InvalidFilterError](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-invalidfiltererror/) class 8 members [MultipleMatchesError](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-multiplematcheserror/) class 8 members [NoMatchError](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-nomatcherror/) class 8 members [OutcomeUnknown](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-outcomeunknown/) class 8 members [ProtocolError](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-protocolerror/) class 8 members [SubscriptionOverflow](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-subscriptionoverflow/) class 9 members [TargetNotFoundError](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-targetnotfounderror/) class 8 members [TransportError](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-transporterror/) class 8 members [UnsupportedFeatureError](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-unsupportedfeatureerror/) class 8 members Constants and enums 5 types [CommandResult](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-commandresult/) class 11 members [ControlEvent](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-controlevent/) class 13 members [GroupResult](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-groupresult/) class 5 members Final client status cannot attribute a merged group result to individual steps. [Options](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-options/) class 4 members Explicit acquisition and mutation at one option scope. [TerminalResult](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-terminalresult/) class 6 members Terminal bytes go directly to the caller's TTY and are not captured. Async 1 type [Async](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-async/) module 6 members Other 3 types [Entity](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-entity-bg78/) class 12 members [EntityRef](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-entityref-162n/) class 9 members A target belongs to one open server binding; names never identify it. [Support](https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-support/) module 3 members Here "support" means which tmux releases libtmux supports, not helper code. Every server handle checks its daemon's release before any command runs; this module exposes that check.