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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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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.