# CallerIdentity.isOn(serverProcessID:)

- **Module:** CallerIdentity
- **Package:** libtmux-swift
- **Language:** Swift
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-swift/blob/f02a4668570e1cc5198c941413750e021f42c214/Sources/LibTmuxMCP/Caller.swift#L37
- **Page:** https://libtmux.org/reference/swift/calleridentity-ison(serverprocessid-)/

```
CallerIdentity.isOn(serverProcessID:)(serverProcessID: Int?) -> Bool
```

Whether `server` is the tmux this process is running inside.