This variable allows you to read through relative file record locks in Windows environments. This means that READs that do not assert a lock are allowed to READ a relative file record even if it is locked by another process. To turn on the read through capability, all processes accessing the relative file must set the configuration variable REL_LOCK_READ_THROUGH to 1 (on, true, yes). When this variable is turned on, the Vision library uses an alternate location for relative file record locks that does not block other processes from reading the records. This is necessary because Windows has "enforced" file locks that preclude all other access to the locked region. Failure to set the configuration variable to the same value on all processes accessing the relative file results in undefined behavior. This variable has no effect on UNIX platforms. See Handling Files for more information about relative files and record locking.