Help: http-port
Bounty program for improvements to Tcl and certain Tcl packages.
Tcl 2019 Conference, Houston/TX, US, Nov 4-8
Send your abstracts to tclconference@googlegroups.com
or submit via the online form by Sep 9.

The "http-port" setting:

The default TCP/IP port number to use by the "server"
and "ui" commands.