An external file which is brought into the EDIT/3000 subsystem (copied into the WORK file) with a JOIN
command (see Section III) is called the JOIN file. All or any portion of a file may be copied into the WORK file with the JOIN command. The information can be added to the end of the current WORK file or it can be
inserted into the WORK file at any point. For example, seven lines from a JOIN file could be inserted between
lines 13 and 14 of the current WORK file. The contents of the existing JOIN file are not altered by the JOIN
command.
