Today International SQL-Ledger Network Association releases free user guide for Ledger123. (the enhanced SQL-Ledger)
This user guide has been written by Sebastian Weitmann and me over the past one and half year. A lot of discussion happened on email and skype while we planned and wrote this book. Finally we met in Cologne, Germany last month (Dec, 2014) and put the finishing touches to this work.
And here you have its first edition in your hands now.
Visit ISNA website to get your free copy.