Product experts from 4D, Inc. will present a series of sessions on using the 4th Dimension (4D) development environment at the OpenBase Developers Conference, in Maui, Sept. 2-6. 4D is a relational application and Web development tool. The 4D product line includes Mac and Windows based tools for development, deployment, productivity, connectivity and Internet servers that can be used together or as individual components. Aug. 2 is the deadline for registering for the OpenBase Developers Conference.