The pages on this site contain documentation for very old MS-DOS software,
purely for historical purposes.
If you're looking for up-to-date documentation, particularly for programming,
you should not rely on the information found here, as it will be woefully
out of date.
dGutter
Gutter
The inner margins of facing pages of a document:
left margin on odd pages, right margin on even
pages. Often these margins must be wider than the
outside margins to allow extra space for binding.