Use the File menu on the main window as follows:

  Action               Function
  ------               --------

  Run Image...         Brings a program under debugger
                       control by specifying an executable
                       image.

  Run Foreign          Brings a program under debugger
   Command...          control by specifying a foreign
                       command symbol.

  Rerun Same...        Reruns the same program under
                       debugger control.

  Browse Sources       Lists the modules in your program.
                       You can choose to list all modules,
                       or only those for which symbolic
                       information is available.  You can
                       display the source code in any module
                       of your program for which symbolic
                       information is available.

                      Can also be used to set breakpoints on
                       routines.

  Display Line         Displays or hides line numbers in the
   Numbers             main window.

  Server Connection... (Client-Server only) Invokes the
                       Server Connection dialog to allow you to
                       set up and control a connection between a
                       debug client and a debug server.

  Exit Debug?          Exits from the debugger.  If running
                       in client-server mode, allows you
                       to exit either the client, server,
                       or both.