This is Kevin Montuori's trivial-ldap, with a few modifications. Details and code here.
Way back in 1985, I had an HP41 calculator with a barcode wand, but I didn't have a way of generating barcodes for it. In 2011, after upgrading my HP41 to HP41CL (basically, replacing the processor board with a modern implementation that runs faster and includes a huge amount of the software written for the HP41), I wrote a barcode generator that uses HTML, javascript and SVG. Code here, with an on-line demo here.
Two simple utilities named CLWriter.exe and CLReader.exe. These are trivial .NET programs, and hence only work under Windows. Code here.