Two major applications that use byte range locks are Open Office and Microsoft Office (Word, Excel, ...). They use them to coordinate sharing a document when more than one person opens the file. These applications typically get a byte range lock on a single byte at a predetermined offset, then write data into the file about who has the file open. This way, when someone else opens the file, they can find out who else has the file open. Word is of course going through SAMBA to access the file system.
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