The "ui" command:

Usage: fossil server ?OPTIONS? ?REPOSITORY?
   Or: fossil ui ?OPTIONS? ?REPOSITORY?

Open a socket and begin listening and responding to HTTP requests on
TCP port 8080, or on any other TCP port defined by the -P or
--port option.  The optional argument is the name of the repository.
The repository argument may be omitted if the working directory is
within an open checkout.

The "ui" command automatically starts a web browser after initializing
the web server.  The "ui" command also binds to 127.0.0.1 and so will
only process HTTP traffic from the local machine.

In the "server" command, the REPOSITORY can be a directory (aka folder)
that contains one or more respositories with names ending in ".fossil".
In that case, the first element of the URL is used to select among the
various repositories.

By default, the "ui" command provides full administrative access without
having to log in.  This can be disabled by setting turning off the
"localauth" setting.  Automatic login for the "server" command is available
if the --localauth option is present and the "localauth" setting is off
and the connection is from localhost.

Options:
  --localauth         enable automatic login for requests from localhost
  -P|--port TCPPORT   listen to request on port TCPPORT
  --th-trace          trace TH1 execution (for debugging purposes)

See also: cgi, http, winsrv