* Locks a region in an open file. * Locking a region prevents other processes from accessing the region. DECLARE INTEGER LockFile IN kernel32; INTEGER hFile, INTEGER dwFileOffsetLow,; INTEGER dwFileOffsetHigh,; INTEGER nNumberOfBytesToLockLow,; INTEGER nNumberOfBytesToLockHigh DECLARE INTEGER UnlockFile IN kernel32; INTEGER hFile, INTEGER dwFileOffsetLow,; INTEGER dwFileOffsetHigh,; INTEGER nNumberOfBytesToUnlockLow,; INTEGER nNumberOfBytesToUnlockHighFoxPro code sample