The INCLUDE (abbreviated INC) command copies external files into text
buffers.

Format: INCLUDE file-spec [range]

The specified file is copied to the location before the first line of
the range. Note that range specifies the position to which the file will
be copied; it does not restrict the portion of the file which will be
included.  To include part of a file, first INCLUDE the file into a
buffer; then COPY the desired portion of the included text into the
appropriate buffer.