The LIKEFILE keyword is used to define a prototyped parameter as a file
with the same characteristics as the filename parameter.
Note:
In the following discussion, the term file parameter is used for the parameter
within the procedure that was defined using the LIKEFILE keyword, the term
parent file is used for the parameter of the LIKEFILE keyword whose definition
is used to derive the definition of the parameter, and the term passed file
is used for the file that is passed to the procedure by the caller.