# u71a2 user exit

User exit u71a2 returns the port number
of the current process, and places it in the output buffer.

## See also

- [Port number](https://d3codex.com/definitions/port-number/)
- [PROC processor user exits](https://d3codex.com/proc/proc-processor-user-exits/)
- [who command](https://d3codex.com/tcl/who-command/)

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Source: https://d3codex.com/proc/u71a2-user-exit/ - part of the D3Codex reference.