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N_XUNLOCK()
Release most recent N_XRLOCK() in current table, or all tables

Syntax
N_XUNLOCK([<lAll>])

RDD
Use UNLOCK or DBUNLOCK()

Argument
<lAll>, if .T., releases all locks in all tables open at the current 
station. If .F., or if the argument is omitted, then the current N_XRLOCK() 
issued in the current area is released.

Remarks
It is not possible to unlock selected records.
Locks applied by other stations are not affected.

Example
DO WHILE !N_XRLOCK()  && lock record
ENDDO
N_XREPLACE()
N_XUPDATE()           && write out data
N_XUNLOCK()