I am wondering how can I start to develop some integrations for SAP B1. My goal is to insert sales order and payment from customer from desktop application develped with Csharp and Visual Studio via bobs.dll o boui.dll (not sure which one is correct). What should I do do accomplish this? I would like to install SAP B1 (9.0 or 9.1) to my local machine to start develop. Should I purchase license for this?