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                                 Locks a file                                 
function PXNetFileLock
   (FileName         : String;            { name of file to lock            }
    LockType         : Integer): Integer; { type of lock (FL, WL, PFL, PWL) }
Errors: PXERR_FILEBUSY            3  File is busy
        PXERR_FILELOCKED          4  File is locked
        PXERR_INVLOCKCODE       106  Invalid lock code
        PXERR_NONETINIT         107  Engine not initialized with PXNetInit
        PXERR_INVFILENAME       108  Invalid file name | 
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