UNLOCK - mkilgore/QB64pe GitHub Wiki

This statement opens access to parts or all of a file to other programs and network users.

Syntax

UNLOCK [#]fileNumber%

UNLOCK [#]fileNumber%, record&

UNLOCK [#]fileNumber%, [firstRecord&] TO lastRecord&

fileNumber% is the file number of the file to unlock.
In the first syntax, the entire file is unlocked.
In the second syntax, record& is the record number of the file to unlock.
In the third syntax, the records or bytes in the range [firstRecord&,lastRecord&] are unlocked. If firstRecord& is omitted, it is assumed to be the first record or byte.
For files opened in BINARY mode, each record corresponds to a single byte.
LOCK and UNLOCK statements are always used in pairs and each statement must match the other one.
Files must be unlocked before other programs can access them, and before the file is closed.
Keyword Not Supported in Linux or MAC versions