Record level Identifier gives the information about the

specific record format in the file. This can be used to

make sure that the record format of the file is same at

present as it was when the program was compiled.This will

protect the program from going into error due to changes

made to the record format after the compilation of the

program.The system tells the program, when it tries to open

the file, that a significant change occurred to the

definition of the file since the last time the program was

compiled.