The WebUI Application is a web application that connects to SAP Business One via Service Layer or DI-Server, and to Avalara services to calculate taxes and post documents to SAP and the Avalara Portal. The application is a web application, hosted on Internet Information Services, accessible by a URL, which will be provided to you when you installed it in your environment. 

The functionality is the same as Document Generation Wizard, but we recommend WebUi when you have a lot of daily document generation, this tool goes faster than DGW, and also be able to schedule reconciliation to run the process when you want to.