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dfFileIsLock()
Verification of a active lock on a file
------------------------------------------------------------------------------
Syntax:

     dfFileIsLock(<cFile>) --> lIsLock

Parameters:

     <cFile>    File to verify if there is a lock.
     The single lock control if  implemented
     from the function dfFileLock. DEFAULT ALIAS()

Returns:

     <lIsLock> If .T. the file has an active LOCK

Description:

     Permits to control a given file with a active LOCK. This LOCK must be
     placed by the function dfFileLock

Example:

     LOCAL aFile:={}
     IF Cli->(dfFileIsLock() )  // Control of the Lock
        Cli->(dfFileLock(aFile) )  // Lock of the file
     ENDIF
     
     dfFileUnLock(aFile)  // UnLock of the files

See also:

     dfFileLock(), dfFileUnLock(), dfNet()