This document provides instructions for attending a Delft3D 4 Open Source Workshop. It outlines steps to download and prepare the necessary source code and software for the workshop exercises. Attendees are instructed to download code from Deltares SVN repositories and check that their Visual Studio installation includes Service Pack 1 if developing on Windows. The workshop will cover Delft3D code management, development environments, and exercises on the general code structure of Delft3D-FLOW, -MOR, and -WAVE modules.