IO_READ_LOCK_TEST

When this variable is set to 1 (on, true, yes), the runtime will cause a read with no lock to fail if the file is opened for I-O and the record is locked. This setting will work with Vision files only. The setting is provided for compatibility with some other COBOL systems. The default value is 0 (off, false, no). The default behavior is to allow the read to succeed.