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Set editor -E<cmd>

A -E<cmd> option can be used to change the editor string to the specified <cmd> while the interpreter is running. The editor string is usually initialized from the environment when the interpreter starts running. Any occurrences of %d and %s in the editor option are replaced by the start line number and the name of the file to be edited, respectively, when the editor is invoked. If specified, the line number parameter is used to let the interpreter start the editor at the line where an error was detected, or, in the case of the :find command, where a specified variable was defined.

Other editors can be selected. For example, you can use the following value to configure Hugs to use emacs: 

 -E"emacs +%d %s"
More commonly, emacsclient or gnuclient is used to avoid starting a new emacs with every edit.

On Windows/DOS, you can use -Eedit for the standard DOS editor, or -Enotepad for the Windows notepad editor. However, neither edit or notepad allow you to specify a start line number, so you may prefer to install a different editor.