# tmux.WindowFilter.SessionIDIn

- **Module:** tmux.WindowFilter
- **Package:** github.com/libtmux/libtmux-go/tmux
- **Language:** Go
- **Kind:** attribute
- **Source:** https://github.com/libtmux/libtmux-go/blob/52968a3181c1c9e6d1b26c565d4b170968ae61c0/tmux/filter_generated.go#L54
- **Page:** https://libtmux.org/en/go/latest/reference/tmux-windowfilter-sessionidin/

SessionIDIn lists accepted values for the stable tmux session identifier from Window.SessionID, including its $ sigil. A candidate matches when its materialized value equals one listed value. A nil slice leaves SessionIDIn unset; a non-nil empty slice is invalid.