Final answer:
The OVERRIDE option in PROC APPEND forces the concatenation of files despite syntax errors.
Step-by-step explanation:
The overridden PROC APPEND command can be used to concatenate files even if there are syntax errors in the program. The OVERRIDE option ignores any errors and continues with the concatenation process. This can be useful when you want to combine multiple files even if there are inconsistencies or mistakes in the data or syntax. By using the OVERRIDE option, you can force PROC APPEND to ignore errors and proceed with the concatenation.