Include header file in destination format.
|Type & position:||command, preamble|
|Description:||The file is included at the beginning of a page without
conversion. If you use this command in the preamble, the file will be
used at the beginning of each page. If you use it inside a node, the
file will be used for this node only.|
This command is currently supported by HTML and RTF only.
|Exists since:||Release 6 Patchlevel 10|
|See also:||!use_raw_footer, !ignore_raw_header|