FirstClass Rapid Application Developer (RAD) was the predecessor to FCAS. Applications built with the RAD.DLL version will continue to function on FCAS with no changes, rebuilding, or code changes in most cases. There are a few exceptions due to the fact that FCAS can be run on a separate machine from the server: •       You will have to update applications that are coded to do file access on files that: •       are located on the server machine •       can't be moved to the FCAS machine or have changed paths hard coded into the application. •       Data sources on the new machine will need to be updated to match the server's configuration. If data sources are hard coded into the application, the application may need to be updated. The FCPOFolder command now returns the directory that FCAS.exe was launched from, so that applications using this can continue to function without modification.