Preserving Variable Length Record Descriptor Words

When using extended VLR, the exact contents of a variable length file are preserved, as follows:

If a variable length file is sent from z/OS to another system that supports extended VLR, then the exact contents are saved. When that file is then transmitted to a z/OS system, the resulting file contents are the same.
EBCDIC/BINARY/ASCII/VLR, if set to VLR, sends the z/OS record descriptor words to the receiving system. If the receiving system also contains Extended Variable Length Record support, then the record descriptor words are saved along with the record. When that file is then transmitted to a z/OS system, the resulting file is identical to the original sending file.