UNLOCK Statement Details
 
Syntax
  UNLOCK [#] filenumber [,{record| [start] TO end}]
 
The UNLOCK statement is used only after a LOCK statement. See the
<LOCK STATEMENT DETAILS> for more information.
 
For binary mode files, the arguments record, start, and end represent the
number of a byte relative to the beginning of the file. The first byte
in a file is byte 1.
 
For random access files, these arguments are the number of a record
relative to the beginning of the file. The first record is record 1.