# Port number

A port number is the sequentially-assigned number associated
with each physical line or process on the system. The number of ports
is determined by issuing the where command with
a z option.

For documentation purposes, the term *line* is frequently
used in place of port number. Unless otherwise noted, their meanings
are typically the same.

## See also

- [%kill() function](https://d3codex.com/pickbasic-flashbasic/percent-kill-function/)
- [case command](https://d3codex.com/tcl/case-command/)
- [check-ws command](https://d3codex.com/tcl/check-ws-command/)
- [coldstart command](https://d3codex.com/tcl/coldstart-command/)
- [converse command](https://d3codex.com/tcl/converse-command/)
- [d3 command](https://d3codex.com/unix/d3-command/)
- [dcd command](https://d3codex.com/tcl/dcd-command/)
- [dtr-off command](https://d3codex.com/tcl/dtr-off-command/)
- [dtr-on command](https://d3codex.com/tcl/cdtr-on-command/)
- [end command (TCL commands)](https://d3codex.com/tcl/end-command-tcl-commands/)
- [jobs file](https://d3codex.com/systemfiles/jobs-file/)
- [kill command](https://d3codex.com/tcl/kill-command/)
- [link-pibdev command](https://d3codex.com/tcl/link-pibdev-command/)
- [list-lines command](https://d3codex.com/tcl/list-lines-command/)
- [list-logoffs command](https://d3codex.com/tcl/list-logoffs-command/)
- [list-pibs macro](https://d3codex.com/tcl/list-pibs-macro/)
- [listabs command](https://d3codex.com/tcl/listabs-command/)
- [Locking scheme](https://d3codex.com/definitions/locking-scheme/)
- [logoff command](https://d3codex.com/tcl/logoff-command/)
- [logon command](https://d3codex.com/tcl/logon-command/)
- [mirror command](https://d3codex.com/tcl/mirror-command/)
- [modem-off macro](https://d3codex.com/tcl/modem-off-macro/)
- [modem-on macro](https://d3codex.com/tcl/modem-on-macro/)
- [Background/Phantom process overview](https://d3codex.com/backgroundphantomprocess/background-phantom-process-overview/)
- [pibs file](https://d3codex.com/systemfiles/pibs-file/)
- [psr command](https://d3codex.com/tcl/psr-command/)
- [set-batch command](https://d3codex.com/tcl/set-batch-command/)
- [set-baud command](https://d3codex.com/tcl/set-baud-command/)
- [set-port command](https://d3codex.com/tcl/set-port-command/)
- [sp-assign command](https://d3codex.com/tcl/sp-assign-command/)
- [startlog command](https://d3codex.com/tcl/startlog-command/)
- [startptr command](https://d3codex.com/tcl/startptr-command/)
- [startsched command](https://d3codex.com/backgroundphantomprocess/startsched-command/)
- [startspooler command](https://d3codex.com/tcl/startspooler-command/)
- [system() function](https://d3codex.com/pickbasic-flashbasic/system-function/)
- [t-det command](https://d3codex.com/tcl/t-det-command/)
- [tandem command](https://d3codex.com/tcl/tandem-command/)
- [tcl command](https://d3codex.com/tcl/tcl-command/)
- [tcls command](https://d3codex.com/tcl/tcls-command/)
- [trap command](https://d3codex.com/tcl/trap-command/)
- [u0191 user exit](https://d3codex.com/proc/u0191-user-exit/)
- [u1191 user exit](https://d3codex.com/proc/u1191-user-exit/)
- [u3191 user exit](https://d3codex.com/proc/u3191-user-exit/)
- [u31ad user exit](https://d3codex.com/proc/u31ad-user-exit/)
- [u71a2 user exit](https://d3codex.com/proc/u71a2-user-exit/)
- [unlink-pibdev command](https://d3codex.com/tcl/unlink-pibdev-command/)
- [what command](https://d3codex.com/tcl/what-command/)
- [where command](https://d3codex.com/tcl/where-command/)
- [wheres command](https://d3codex.com/tcl/wheres-command/)
- [who command](https://d3codex.com/tcl/who-command/)
- [xcs command](https://d3codex.com/tcl/xcs-command/)
- [xcs-off macro](https://d3codex.com/tcl/xcs-off-macro/)
- [xcs-on macro](https://d3codex.com/tcl/xcs-on-macro/)
- [xonoff command](https://d3codex.com/tcl/xonoff-command/)

---
Source: https://d3codex.com/definitions/port-number/ - part of the D3Codex reference.