VSAM KSDS Files:

**CUSTFILE** -- Customer master file. Primary key: CUST-NUMBER (10 bytes). Record length: 500 bytes. Layout defined in `capstone-customer.cpy`. - **ACCTFILE** -- Account master file. Primary key: ACCT-NUMBER (10 bytes). Alternate key: ACCT-CUST-NUMBER (non-unique, with duplicates). Record length: 40