$book = '..'?>include "$book/mh.php"; includeHeader('cosemime.html', 'reprep-2.html'); ?>
The explanation of generic mail-sending commands in the Section Overview: Sending MH Messages, along with the introduction in the Section Sending Some Mail: comp, send, cover comp pretty well.
Besides starting new mail messages, the main use of comp is editing existing draft messages with the comp -use command. For details, see the Section Working with Draft Messages. includeFooter('$Date: 2006-05-31 15:13:43 -0700 (Wed, 31 May 2006) $', 'OReilly: 1991, 1992, 1995'); ?>